Definition of accretion in English:

accretion

noun əˈkriːʃ(ə)nəˈkriʃ(ə)n

mass noun

1Growth or increase by the gradual accumulation of additional layers or matter.
积淀；增生
the accretion of sediments in coastal mangroves
海岸红树林里沉积物的增加。
figurative the growing accretion of central government authority
〈喻〉中央政府权力的不断集中。
Example sentencesExamples
- He has some (very large) movie files, along with selected stills of the formation of a ‘lunar seed’ through the rapid growth and accretion of particles.
- A sample curve would probably be organised in a series of steps - with gradual accretion of insight being the normal, but with occasional significant massive leaps also occurring.
- Los Angeles itself grows by accretion, creeping eastward through the San Gorgonio Pass along the line of the San Andreas Fault, bulldozing further and further into the Mojave Desert.
- Usually when one talks about a Darwinian explanation for something, the intention is to explain how the prolonged action of natural selection led to the formation of a complex structure through a process of gradual accretion.
- His auspicious debut might have given him the leverage to realize some of his grander plans, but the Simon Fraser film grad says his films have grown by steady accretion of ideas and details, rather than an overarching scheme.
- Gentle but steady water movement produced by slow flow through lakes and meandering backwater stream channels provides aeration and slow accretion of alluvial sediments.
- The sheer accretion of information about things is not enough.
- Theoretically, the result over time is the accretion of enough additional muscle mass to create both a visual difference and an increase in strength.
- The individual crystal grains that comprise these rocks have grown by molecular accretion, and the resultant interlocking structure is commonly extremely strong when the crystals are randomly orientated.
- A quiet work that slowly gathers momentum through accretion of personalities and individual histories, Homestead is the story of a small valley in Austria between 1906 and 1977.
- The interior appears to have grown organically over time by a process of accretion similar to the formation of mould.
- In other words, accretion occurs by the gradual acts of the sea or the water in a tidal area, and if something dramatic happens, like a reclamation, that cannot add anything to anybody's land.
- And since that time, we've seen the gradual accretion of confidence in intervention in the cause of human rights, plus a fairly impressive armory of techniques and accomplices.
- On the other side of the coin, if we hypothesize that complex structures arise by gradual accretion and natural selection, then we would expect those structures to bear evidence of history.
- That's not what geologists expect from the gradual accretion of crust at plate boundaries, but it could be the handiwork of episodic volcanic outbursts, fed by broad plumes of rock that rose periodically from deep in the mantle.
- The leaves and stems of plants in brilliant primaries, created by the gradual accretion of six single-colour woodblocks, reach out across the space of the fabric.
- The most negatively affected birds are those characterized by the otherwise desirable traits of rapid growth and muscle accretion.
- The list of international crimes, that is of the acts for whose accomplishment international law makes the authors criminally responsible, has come into being by gradual accretion.
- Sponges grow by accretion and therefore lack a fixed primary axis.
- That bone grows through accretion, and is not extensively remodeled as the animal matures.
Synonyms
accumulation, collecting, gathering, amassing, cumulation, accrual, growth, formation, enlargement, increase, gain, augmentation, rise, mushrooming, snowballing
rare amassment
1. 1.1count noun A thing formed or added by gradual growth or increase.
  积淀物，积聚物
  the city has a historic core surrounded by recent accretions
  该市有个被新建城区包围起来的充满历史韵味的中心区。
  Example sentencesExamples
  Subsequent accretions were dismissed as degenerative.
  Once this was done, and the buildings cleared of unnecessary accretions, the architect was left with an enormous double-height volume, requiring a new first floor, and a smaller vaulted one with a chamber above.
  Hospitals, in this country at least, tend to be accretions, as various periods of architecture and expertise are layered one on top of another: here a block of airy Victorian wards, there a rigorous piece of post-war functionalism.
  Unfortunately it's weighted down with accretion upon accretion of utterly self-indulgent pomposity.
  In these pieces, which suggest, among other possibilities, Aztec or Mayan reliefs, Toledo inscribed fine traceries of animal figures on caked, mortarlike accretions of sand and pigment.
  Unnecessary and unsightly accretions have been stripped away and the building replanned to accommodate new teaching spaces and laboratories.
  Beyond these accretions and intentional change, the space, the vistas, the juxtapositions and potential paths generated by the new building are probably the greatest difference.
  The desert ends with a steeply shelving cliff against the ocean, where layers of alluvial accretion are exposed like a lesson in geological stratification.
  Admittedly, a lot of Blade Runner's architecture is megastructural, but the overall look is one of layering - accretions built up over the decades.
  All she was doing was peeling away some of the years of socialist accretions.
  Painted in 1520 on thin wood which is now badly warped, it will require delicate and major surgery over the next few months to remove the accretions of time, coal dust and candle smoke.
  And what this work shows, the work of historians of religion, is that in fact these kinds of texts are accretions that develop over time, they come out of arguments - you can show what those arguments are.
  Instead of demolition, however, Swan Hall enjoyed the most devoted restoration of its long life. The team working for Rochford Hall Ltd stripped out the uglier accretions of the centuries, exposing the wondrous oak framework.
  Those involved in the reform after Vatican II would have seen themselves preserving the basic core of the Roman rite, as they pruned back some of the historical accretions that kept that core from shining through.
  He had found a dozen identifiable Spanish gold coins and a collection of objects that might prove interesting when the restoration experts at the museum in Barnstaple had removed accretions gathered over several centuries.
  It is like a country house, with wings and accretions of differing styles and periods clustered around the original 17 th-century core.
  This has the added bonus of dissolving those crusty accretions that make one's toothpaste tube a complete social disgrace.
  Her paintings become accretions, spiritual and physical.
  To this end, the State Apartments were stripped of recent accretions with the exception of the Bedchamber, which remains to this day more or less as used by Princess Victoria.
  War strips us of the later accretions of civilization and lays bare the primal man in each of us.
  Synonyms
  addition, extension, growth, appendage, add-on, supplement
2. 1.2Astronomy The coming together and cohesion of matter under the influence of gravitation to form larger bodies.
  〔天文〕吸积
  during the later stages of accretion the outer 100 km or so of the Moon melted
  Example sentencesExamples
  These details support the theory that the two stars are close enough for accretion to take place and that the companion star is being cannibalised.
  You just don't get giant rotating disks from the accretion of small galaxy fragments.
  Turns out, fortunately, that the steady and essentially unending accretion of interplanetary and intermoon particles may replenish the rings.
  This scenario proposes that a jovian gas giant forms when, by gradual accretion of rock or ice, a solid planetary core has reached a critical mass of perhaps 10 M.
  The idea of planetary accretion from cold matter was subsequently to be developed by several other geologists and cosmologists.
  This accretion of the gaseous layers is often referred to as the ‘runaway’ stage in the planet's formation, since theory says it is much more rapid than the formation of the core.
  The objects are most likely very primitive: detritus from the early accretion phases of the solar system.
  This energy input could have a profound effect on the evolution of the galaxy by triggering the formation of stars, or inhibiting the growth of the galaxy through accretion of matter from intergalactic space.
  Dr. Livio has done much fundamental work on the topic of accretion of mass onto black holes, neutron stars, and white dwarfs, as well as on the formation of black holes and the possibility to extract energy from them.
  All the planets should have started warm, when gravitational energy was transformed into heat during planetary accretion.
  As the pulsar picks up speed through accretion, any slight distortion in the star's dense, half-mile-thick crust of crystalline metal will allow the pulsar to radiate gravitational waves.
  Before the Apollo samples became available, many planetary scientists had favored an early, intense bombardment associated with the late stages in the accretion of the planets.
  The usual model for these events is that a white dwarf star is gaining mass by accretion from a companion.
  In yet another scenario, the so-called binary planet, or co-accretion, hypothesis, the Earth and the Moon all formed at the same time by the accretion of small bodies.
  We are told that the earth formed by accretion of cosmic dust billions of years ago.
  So instead of joining into a single big object, asteroids began to strike each other at high speeds, several kilometres per second, often resulting in catastrophic fragmentation and disruption rather than accretion.
  The theory of core accretion supposes the collisional accumulation of solid bodies, the process that is universally accepted as the formation mechanism of the terrestrial planets.
  We also need to know which clusters have experienced a recent substantial gravitational accretion of mass, and which clusters are in a stage of collision and merging.
  That's consistent with the theory that the moon formed not from the accretion of smaller bodies but by the collision of a planet with the newly formed Earth.
  Of course, anybody familiar with the way that planets are formed by the gradual accretion of matter in orbit around a star will be aware that this couldn't happen.

Derivatives

accretive

adjective

In the first instance, it should be noted that the process of change that they inaugurated was gradual and accretive rather than immediate and imposed, reflecting an ideal of cooperative participation of public and private interests.
Example sentencesExamples
- A display of Beuys's work is trickier still because the artists's installations were fluid, accretive and subject to change.
- Having Dobyns represent this veritable ocean is like having Hejinian represent not just that stretch of accretive shoreline called Language poetry but the entire business of circumference.
- Luck, Boccaccio implies, is what separates a healthy life from one marked by disease, and what distinguishes in stature the obsessive markings of one sister from the equally obsessive, accretive projects of the other.
- In those cases, a shell opening is self-defined by the growing accretive margin of the shell.
- In ‘The Sea-Cucumber’, George Johnston's son has discovered how to make the most of his extraordinary gifts, his encyclopaedic knowledge, accretive wit, sudden darts of speculative fancy.
- Conceived as an accretive extension of the public realm, Norwich's Millennium Centre adds to the city's social, intellectual and civic life.
- But the case of St George's is different, as here we are dealing, not with an organic, accretive structure, but with the unified conception of one great mind.
- Hip hop and rap, spreading their accretive gospel of preening commercialism and misogynistic narcissism, were still in ascendancy.
- Culture is often accretive, in that it builds on the past, but equally it can lose technologies, sciences and ideas.
- They fuse the artist's accretive sensibility with her decade-long focus on the authoritative power of the book - a power earned through its contents as well as through its seductive tactility as an object.

Origin

Early 17th century: from Latin accretio(n-), from accrescere 'become larger' (see accrete).

Rhymes

Capetian, completion, concretion, deletion, depletion, Diocletian, excretion, Grecian, Helvetian, repletion, Rhodesian, secretion, suppletion, Tahitian, venetian

Definition of accretion in US English:

accretion

nounəˈkriʃ(ə)nəˈkrēSH(ə)n

1The process of growth or increase, typically by the gradual accumulation of additional layers or matter.
积淀；增生
the accretion of sediments in coastal mangroves
海岸红树林里沉积物的增加。
figurative the growing accretion of central government authority
〈喻〉中央政府权力的不断集中。
Example sentencesExamples
- The most negatively affected birds are those characterized by the otherwise desirable traits of rapid growth and muscle accretion.
- Usually when one talks about a Darwinian explanation for something, the intention is to explain how the prolonged action of natural selection led to the formation of a complex structure through a process of gradual accretion.
- He has some (very large) movie files, along with selected stills of the formation of a ‘lunar seed’ through the rapid growth and accretion of particles.
- And since that time, we've seen the gradual accretion of confidence in intervention in the cause of human rights, plus a fairly impressive armory of techniques and accomplices.
- A sample curve would probably be organised in a series of steps - with gradual accretion of insight being the normal, but with occasional significant massive leaps also occurring.
- The list of international crimes, that is of the acts for whose accomplishment international law makes the authors criminally responsible, has come into being by gradual accretion.
- In other words, accretion occurs by the gradual acts of the sea or the water in a tidal area, and if something dramatic happens, like a reclamation, that cannot add anything to anybody's land.
- The leaves and stems of plants in brilliant primaries, created by the gradual accretion of six single-colour woodblocks, reach out across the space of the fabric.
- That bone grows through accretion, and is not extensively remodeled as the animal matures.
- On the other side of the coin, if we hypothesize that complex structures arise by gradual accretion and natural selection, then we would expect those structures to bear evidence of history.
- The individual crystal grains that comprise these rocks have grown by molecular accretion, and the resultant interlocking structure is commonly extremely strong when the crystals are randomly orientated.
- The sheer accretion of information about things is not enough.
- Gentle but steady water movement produced by slow flow through lakes and meandering backwater stream channels provides aeration and slow accretion of alluvial sediments.
- The interior appears to have grown organically over time by a process of accretion similar to the formation of mould.
- Theoretically, the result over time is the accretion of enough additional muscle mass to create both a visual difference and an increase in strength.
- A quiet work that slowly gathers momentum through accretion of personalities and individual histories, Homestead is the story of a small valley in Austria between 1906 and 1977.
- Los Angeles itself grows by accretion, creeping eastward through the San Gorgonio Pass along the line of the San Andreas Fault, bulldozing further and further into the Mojave Desert.
- Sponges grow by accretion and therefore lack a fixed primary axis.
- That's not what geologists expect from the gradual accretion of crust at plate boundaries, but it could be the handiwork of episodic volcanic outbursts, fed by broad plumes of rock that rose periodically from deep in the mantle.
- His auspicious debut might have given him the leverage to realize some of his grander plans, but the Simon Fraser film grad says his films have grown by steady accretion of ideas and details, rather than an overarching scheme.
Synonyms
accumulation, collecting, gathering, amassing, cumulation, accrual, growth, formation, enlargement, increase, gain, augmentation, rise, mushrooming, snowballing
1. 1.1 A thing formed or added by gradual growth or increase.
  积淀物，积聚物
  the city has a historic core surrounded by recent accretions
  该市有个被新建城区包围起来的充满历史韵味的中心区。
  about one-third of California was built up by accretions
  Example sentencesExamples
  Instead of demolition, however, Swan Hall enjoyed the most devoted restoration of its long life. The team working for Rochford Hall Ltd stripped out the uglier accretions of the centuries, exposing the wondrous oak framework.
  In these pieces, which suggest, among other possibilities, Aztec or Mayan reliefs, Toledo inscribed fine traceries of animal figures on caked, mortarlike accretions of sand and pigment.
  All she was doing was peeling away some of the years of socialist accretions.
  It is like a country house, with wings and accretions of differing styles and periods clustered around the original 17 th-century core.
  Unfortunately it's weighted down with accretion upon accretion of utterly self-indulgent pomposity.
  This has the added bonus of dissolving those crusty accretions that make one's toothpaste tube a complete social disgrace.
  Admittedly, a lot of Blade Runner's architecture is megastructural, but the overall look is one of layering - accretions built up over the decades.
  To this end, the State Apartments were stripped of recent accretions with the exception of the Bedchamber, which remains to this day more or less as used by Princess Victoria.
  Hospitals, in this country at least, tend to be accretions, as various periods of architecture and expertise are layered one on top of another: here a block of airy Victorian wards, there a rigorous piece of post-war functionalism.
  Subsequent accretions were dismissed as degenerative.
  The desert ends with a steeply shelving cliff against the ocean, where layers of alluvial accretion are exposed like a lesson in geological stratification.
  War strips us of the later accretions of civilization and lays bare the primal man in each of us.
  And what this work shows, the work of historians of religion, is that in fact these kinds of texts are accretions that develop over time, they come out of arguments - you can show what those arguments are.
  Beyond these accretions and intentional change, the space, the vistas, the juxtapositions and potential paths generated by the new building are probably the greatest difference.
  Painted in 1520 on thin wood which is now badly warped, it will require delicate and major surgery over the next few months to remove the accretions of time, coal dust and candle smoke.
  He had found a dozen identifiable Spanish gold coins and a collection of objects that might prove interesting when the restoration experts at the museum in Barnstaple had removed accretions gathered over several centuries.
  Those involved in the reform after Vatican II would have seen themselves preserving the basic core of the Roman rite, as they pruned back some of the historical accretions that kept that core from shining through.
  Her paintings become accretions, spiritual and physical.
  Unnecessary and unsightly accretions have been stripped away and the building replanned to accommodate new teaching spaces and laboratories.
  Once this was done, and the buildings cleared of unnecessary accretions, the architect was left with an enormous double-height volume, requiring a new first floor, and a smaller vaulted one with a chamber above.
  Synonyms
  addition, extension, growth, appendage, add-on, supplement
2. 1.2Astronomy The coming together and cohesion of matter under the influence of gravitation to form larger bodies.
  〔天文〕吸积
  Example sentencesExamples
  This accretion of the gaseous layers is often referred to as the ‘runaway’ stage in the planet's formation, since theory says it is much more rapid than the formation of the core.
  The idea of planetary accretion from cold matter was subsequently to be developed by several other geologists and cosmologists.
  Of course, anybody familiar with the way that planets are formed by the gradual accretion of matter in orbit around a star will be aware that this couldn't happen.
  Dr. Livio has done much fundamental work on the topic of accretion of mass onto black holes, neutron stars, and white dwarfs, as well as on the formation of black holes and the possibility to extract energy from them.
  That's consistent with the theory that the moon formed not from the accretion of smaller bodies but by the collision of a planet with the newly formed Earth.
  As the pulsar picks up speed through accretion, any slight distortion in the star's dense, half-mile-thick crust of crystalline metal will allow the pulsar to radiate gravitational waves.
  This scenario proposes that a jovian gas giant forms when, by gradual accretion of rock or ice, a solid planetary core has reached a critical mass of perhaps 10 M.
  The objects are most likely very primitive: detritus from the early accretion phases of the solar system.
  We are told that the earth formed by accretion of cosmic dust billions of years ago.
  We also need to know which clusters have experienced a recent substantial gravitational accretion of mass, and which clusters are in a stage of collision and merging.
  This energy input could have a profound effect on the evolution of the galaxy by triggering the formation of stars, or inhibiting the growth of the galaxy through accretion of matter from intergalactic space.
  Turns out, fortunately, that the steady and essentially unending accretion of interplanetary and intermoon particles may replenish the rings.
  All the planets should have started warm, when gravitational energy was transformed into heat during planetary accretion.
  The usual model for these events is that a white dwarf star is gaining mass by accretion from a companion.
  Before the Apollo samples became available, many planetary scientists had favored an early, intense bombardment associated with the late stages in the accretion of the planets.
  You just don't get giant rotating disks from the accretion of small galaxy fragments.
  These details support the theory that the two stars are close enough for accretion to take place and that the companion star is being cannibalised.
  So instead of joining into a single big object, asteroids began to strike each other at high speeds, several kilometres per second, often resulting in catastrophic fragmentation and disruption rather than accretion.
  The theory of core accretion supposes the collisional accumulation of solid bodies, the process that is universally accepted as the formation mechanism of the terrestrial planets.
  In yet another scenario, the so-called binary planet, or co-accretion, hypothesis, the Earth and the Moon all formed at the same time by the accretion of small bodies.

Origin

Early 17th century: from Latin accretio(n-), from accrescere ‘become larger’ (see accrete).

词汇	accretion
释义	Definition of accretion in English: accretion noun əˈkriːʃ(ə)nəˈkriʃ(ə)n mass noun 1Growth or increase by the gradual accumulation of additional layers or matter. 积淀；增生 the accretion of sediments in coastal mangroves 海岸红树林里沉积物的增加。 figurative the growing accretion of central government authority 〈喻〉中央政府权力的不断集中。 Example sentencesExamples He has some (very large) movie files, along with selected stills of the formation of a ‘lunar seed’ through the rapid growth and accretion of particles. A sample curve would probably be organised in a series of steps - with gradual accretion of insight being the normal, but with occasional significant massive leaps also occurring. Los Angeles itself grows by accretion, creeping eastward through the San Gorgonio Pass along the line of the San Andreas Fault, bulldozing further and further into the Mojave Desert. Usually when one talks about a Darwinian explanation for something, the intention is to explain how the prolonged action of natural selection led to the formation of a complex structure through a process of gradual accretion. His auspicious debut might have given him the leverage to realize some of his grander plans, but the Simon Fraser film grad says his films have grown by steady accretion of ideas and details, rather than an overarching scheme. Gentle but steady water movement produced by slow flow through lakes and meandering backwater stream channels provides aeration and slow accretion of alluvial sediments. The sheer accretion of information about things is not enough. Theoretically, the result over time is the accretion of enough additional muscle mass to create both a visual difference and an increase in strength. The individual crystal grains that comprise these rocks have grown by molecular accretion, and the resultant interlocking structure is commonly extremely strong when the crystals are randomly orientated. A quiet work that slowly gathers momentum through accretion of personalities and individual histories, Homestead is the story of a small valley in Austria between 1906 and 1977. The interior appears to have grown organically over time by a process of accretion similar to the formation of mould. In other words, accretion occurs by the gradual acts of the sea or the water in a tidal area, and if something dramatic happens, like a reclamation, that cannot add anything to anybody's land. And since that time, we've seen the gradual accretion of confidence in intervention in the cause of human rights, plus a fairly impressive armory of techniques and accomplices. On the other side of the coin, if we hypothesize that complex structures arise by gradual accretion and natural selection, then we would expect those structures to bear evidence of history. That's not what geologists expect from the gradual accretion of crust at plate boundaries, but it could be the handiwork of episodic volcanic outbursts, fed by broad plumes of rock that rose periodically from deep in the mantle. The leaves and stems of plants in brilliant primaries, created by the gradual accretion of six single-colour woodblocks, reach out across the space of the fabric. The most negatively affected birds are those characterized by the otherwise desirable traits of rapid growth and muscle accretion. The list of international crimes, that is of the acts for whose accomplishment international law makes the authors criminally responsible, has come into being by gradual accretion. Sponges grow by accretion and therefore lack a fixed primary axis. That bone grows through accretion, and is not extensively remodeled as the animal matures. Synonyms accumulation, collecting, gathering, amassing, cumulation, accrual, growth, formation, enlargement, increase, gain, augmentation, rise, mushrooming, snowballing rare amassment 1.1count noun A thing formed or added by gradual growth or increase. 积淀物，积聚物 the city has a historic core surrounded by recent accretions 该市有个被新建城区包围起来的充满历史韵味的中心区。 Example sentencesExamples Subsequent accretions were dismissed as degenerative. Once this was done, and the buildings cleared of unnecessary accretions, the architect was left with an enormous double-height volume, requiring a new first floor, and a smaller vaulted one with a chamber above. Hospitals, in this country at least, tend to be accretions, as various periods of architecture and expertise are layered one on top of another: here a block of airy Victorian wards, there a rigorous piece of post-war functionalism. Unfortunately it's weighted down with accretion upon accretion of utterly self-indulgent pomposity. In these pieces, which suggest, among other possibilities, Aztec or Mayan reliefs, Toledo inscribed fine traceries of animal figures on caked, mortarlike accretions of sand and pigment. Unnecessary and unsightly accretions have been stripped away and the building replanned to accommodate new teaching spaces and laboratories. Beyond these accretions and intentional change, the space, the vistas, the juxtapositions and potential paths generated by the new building are probably the greatest difference. The desert ends with a steeply shelving cliff against the ocean, where layers of alluvial accretion are exposed like a lesson in geological stratification. Admittedly, a lot of Blade Runner's architecture is megastructural, but the overall look is one of layering - accretions built up over the decades. All she was doing was peeling away some of the years of socialist accretions. Painted in 1520 on thin wood which is now badly warped, it will require delicate and major surgery over the next few months to remove the accretions of time, coal dust and candle smoke. And what this work shows, the work of historians of religion, is that in fact these kinds of texts are accretions that develop over time, they come out of arguments - you can show what those arguments are. Instead of demolition, however, Swan Hall enjoyed the most devoted restoration of its long life. The team working for Rochford Hall Ltd stripped out the uglier accretions of the centuries, exposing the wondrous oak framework. Those involved in the reform after Vatican II would have seen themselves preserving the basic core of the Roman rite, as they pruned back some of the historical accretions that kept that core from shining through. He had found a dozen identifiable Spanish gold coins and a collection of objects that might prove interesting when the restoration experts at the museum in Barnstaple had removed accretions gathered over several centuries. It is like a country house, with wings and accretions of differing styles and periods clustered around the original 17 th-century core. This has the added bonus of dissolving those crusty accretions that make one's toothpaste tube a complete social disgrace. Her paintings become accretions, spiritual and physical. To this end, the State Apartments were stripped of recent accretions with the exception of the Bedchamber, which remains to this day more or less as used by Princess Victoria. War strips us of the later accretions of civilization and lays bare the primal man in each of us. Synonyms addition, extension, growth, appendage, add-on, supplement 1.2Astronomy The coming together and cohesion of matter under the influence of gravitation to form larger bodies. 〔天文〕吸积 during the later stages of accretion the outer 100 km or so of the Moon melted Example sentencesExamples These details support the theory that the two stars are close enough for accretion to take place and that the companion star is being cannibalised. You just don't get giant rotating disks from the accretion of small galaxy fragments. Turns out, fortunately, that the steady and essentially unending accretion of interplanetary and intermoon particles may replenish the rings. This scenario proposes that a jovian gas giant forms when, by gradual accretion of rock or ice, a solid planetary core has reached a critical mass of perhaps 10 M. The idea of planetary accretion from cold matter was subsequently to be developed by several other geologists and cosmologists. This accretion of the gaseous layers is often referred to as the ‘runaway’ stage in the planet's formation, since theory says it is much more rapid than the formation of the core. The objects are most likely very primitive: detritus from the early accretion phases of the solar system. This energy input could have a profound effect on the evolution of the galaxy by triggering the formation of stars, or inhibiting the growth of the galaxy through accretion of matter from intergalactic space. Dr. Livio has done much fundamental work on the topic of accretion of mass onto black holes, neutron stars, and white dwarfs, as well as on the formation of black holes and the possibility to extract energy from them. All the planets should have started warm, when gravitational energy was transformed into heat during planetary accretion. As the pulsar picks up speed through accretion, any slight distortion in the star's dense, half-mile-thick crust of crystalline metal will allow the pulsar to radiate gravitational waves. Before the Apollo samples became available, many planetary scientists had favored an early, intense bombardment associated with the late stages in the accretion of the planets. The usual model for these events is that a white dwarf star is gaining mass by accretion from a companion. In yet another scenario, the so-called binary planet, or co-accretion, hypothesis, the Earth and the Moon all formed at the same time by the accretion of small bodies. We are told that the earth formed by accretion of cosmic dust billions of years ago. So instead of joining into a single big object, asteroids began to strike each other at high speeds, several kilometres per second, often resulting in catastrophic fragmentation and disruption rather than accretion. The theory of core accretion supposes the collisional accumulation of solid bodies, the process that is universally accepted as the formation mechanism of the terrestrial planets. We also need to know which clusters have experienced a recent substantial gravitational accretion of mass, and which clusters are in a stage of collision and merging. That's consistent with the theory that the moon formed not from the accretion of smaller bodies but by the collision of a planet with the newly formed Earth. Of course, anybody familiar with the way that planets are formed by the gradual accretion of matter in orbit around a star will be aware that this couldn't happen. Derivatives accretive adjective In the first instance, it should be noted that the process of change that they inaugurated was gradual and accretive rather than immediate and imposed, reflecting an ideal of cooperative participation of public and private interests. Example sentencesExamples A display of Beuys's work is trickier still because the artists's installations were fluid, accretive and subject to change. Having Dobyns represent this veritable ocean is like having Hejinian represent not just that stretch of accretive shoreline called Language poetry but the entire business of circumference. Luck, Boccaccio implies, is what separates a healthy life from one marked by disease, and what distinguishes in stature the obsessive markings of one sister from the equally obsessive, accretive projects of the other. In those cases, a shell opening is self-defined by the growing accretive margin of the shell. In ‘The Sea-Cucumber’, George Johnston's son has discovered how to make the most of his extraordinary gifts, his encyclopaedic knowledge, accretive wit, sudden darts of speculative fancy. Conceived as an accretive extension of the public realm, Norwich's Millennium Centre adds to the city's social, intellectual and civic life. But the case of St George's is different, as here we are dealing, not with an organic, accretive structure, but with the unified conception of one great mind. Hip hop and rap, spreading their accretive gospel of preening commercialism and misogynistic narcissism, were still in ascendancy. Culture is often accretive, in that it builds on the past, but equally it can lose technologies, sciences and ideas. They fuse the artist's accretive sensibility with her decade-long focus on the authoritative power of the book - a power earned through its contents as well as through its seductive tactility as an object. Origin Early 17th century: from Latin accretio(n-), from accrescere 'become larger' (see accrete). Rhymes Capetian, completion, concretion, deletion, depletion, Diocletian, excretion, Grecian, Helvetian, repletion, Rhodesian, secretion, suppletion, Tahitian, venetian Definition of accretion in US English: accretion nounəˈkriʃ(ə)nəˈkrēSH(ə)n 1The process of growth or increase, typically by the gradual accumulation of additional layers or matter. 积淀；增生 the accretion of sediments in coastal mangroves 海岸红树林里沉积物的增加。 figurative the growing accretion of central government authority 〈喻〉中央政府权力的不断集中。 Example sentencesExamples The most negatively affected birds are those characterized by the otherwise desirable traits of rapid growth and muscle accretion. Usually when one talks about a Darwinian explanation for something, the intention is to explain how the prolonged action of natural selection led to the formation of a complex structure through a process of gradual accretion. He has some (very large) movie files, along with selected stills of the formation of a ‘lunar seed’ through the rapid growth and accretion of particles. And since that time, we've seen the gradual accretion of confidence in intervention in the cause of human rights, plus a fairly impressive armory of techniques and accomplices. A sample curve would probably be organised in a series of steps - with gradual accretion of insight being the normal, but with occasional significant massive leaps also occurring. The list of international crimes, that is of the acts for whose accomplishment international law makes the authors criminally responsible, has come into being by gradual accretion. In other words, accretion occurs by the gradual acts of the sea or the water in a tidal area, and if something dramatic happens, like a reclamation, that cannot add anything to anybody's land. The leaves and stems of plants in brilliant primaries, created by the gradual accretion of six single-colour woodblocks, reach out across the space of the fabric. That bone grows through accretion, and is not extensively remodeled as the animal matures. On the other side of the coin, if we hypothesize that complex structures arise by gradual accretion and natural selection, then we would expect those structures to bear evidence of history. The individual crystal grains that comprise these rocks have grown by molecular accretion, and the resultant interlocking structure is commonly extremely strong when the crystals are randomly orientated. The sheer accretion of information about things is not enough. Gentle but steady water movement produced by slow flow through lakes and meandering backwater stream channels provides aeration and slow accretion of alluvial sediments. The interior appears to have grown organically over time by a process of accretion similar to the formation of mould. Theoretically, the result over time is the accretion of enough additional muscle mass to create both a visual difference and an increase in strength. A quiet work that slowly gathers momentum through accretion of personalities and individual histories, Homestead is the story of a small valley in Austria between 1906 and 1977. Los Angeles itself grows by accretion, creeping eastward through the San Gorgonio Pass along the line of the San Andreas Fault, bulldozing further and further into the Mojave Desert. Sponges grow by accretion and therefore lack a fixed primary axis. That's not what geologists expect from the gradual accretion of crust at plate boundaries, but it could be the handiwork of episodic volcanic outbursts, fed by broad plumes of rock that rose periodically from deep in the mantle. His auspicious debut might have given him the leverage to realize some of his grander plans, but the Simon Fraser film grad says his films have grown by steady accretion of ideas and details, rather than an overarching scheme. Synonyms accumulation, collecting, gathering, amassing, cumulation, accrual, growth, formation, enlargement, increase, gain, augmentation, rise, mushrooming, snowballing 1.1 A thing formed or added by gradual growth or increase. 积淀物，积聚物 the city has a historic core surrounded by recent accretions 该市有个被新建城区包围起来的充满历史韵味的中心区。 about one-third of California was built up by accretions Example sentencesExamples Instead of demolition, however, Swan Hall enjoyed the most devoted restoration of its long life. The team working for Rochford Hall Ltd stripped out the uglier accretions of the centuries, exposing the wondrous oak framework. In these pieces, which suggest, among other possibilities, Aztec or Mayan reliefs, Toledo inscribed fine traceries of animal figures on caked, mortarlike accretions of sand and pigment. All she was doing was peeling away some of the years of socialist accretions. It is like a country house, with wings and accretions of differing styles and periods clustered around the original 17 th-century core. Unfortunately it's weighted down with accretion upon accretion of utterly self-indulgent pomposity. This has the added bonus of dissolving those crusty accretions that make one's toothpaste tube a complete social disgrace. Admittedly, a lot of Blade Runner's architecture is megastructural, but the overall look is one of layering - accretions built up over the decades. To this end, the State Apartments were stripped of recent accretions with the exception of the Bedchamber, which remains to this day more or less as used by Princess Victoria. Hospitals, in this country at least, tend to be accretions, as various periods of architecture and expertise are layered one on top of another: here a block of airy Victorian wards, there a rigorous piece of post-war functionalism. Subsequent accretions were dismissed as degenerative. The desert ends with a steeply shelving cliff against the ocean, where layers of alluvial accretion are exposed like a lesson in geological stratification. War strips us of the later accretions of civilization and lays bare the primal man in each of us. And what this work shows, the work of historians of religion, is that in fact these kinds of texts are accretions that develop over time, they come out of arguments - you can show what those arguments are. Beyond these accretions and intentional change, the space, the vistas, the juxtapositions and potential paths generated by the new building are probably the greatest difference. Painted in 1520 on thin wood which is now badly warped, it will require delicate and major surgery over the next few months to remove the accretions of time, coal dust and candle smoke. He had found a dozen identifiable Spanish gold coins and a collection of objects that might prove interesting when the restoration experts at the museum in Barnstaple had removed accretions gathered over several centuries. Those involved in the reform after Vatican II would have seen themselves preserving the basic core of the Roman rite, as they pruned back some of the historical accretions that kept that core from shining through. Her paintings become accretions, spiritual and physical. Unnecessary and unsightly accretions have been stripped away and the building replanned to accommodate new teaching spaces and laboratories. Once this was done, and the buildings cleared of unnecessary accretions, the architect was left with an enormous double-height volume, requiring a new first floor, and a smaller vaulted one with a chamber above. Synonyms addition, extension, growth, appendage, add-on, supplement 1.2Astronomy The coming together and cohesion of matter under the influence of gravitation to form larger bodies. 〔天文〕吸积 Example sentencesExamples This accretion of the gaseous layers is often referred to as the ‘runaway’ stage in the planet's formation, since theory says it is much more rapid than the formation of the core. The idea of planetary accretion from cold matter was subsequently to be developed by several other geologists and cosmologists. Of course, anybody familiar with the way that planets are formed by the gradual accretion of matter in orbit around a star will be aware that this couldn't happen. Dr. Livio has done much fundamental work on the topic of accretion of mass onto black holes, neutron stars, and white dwarfs, as well as on the formation of black holes and the possibility to extract energy from them. That's consistent with the theory that the moon formed not from the accretion of smaller bodies but by the collision of a planet with the newly formed Earth. As the pulsar picks up speed through accretion, any slight distortion in the star's dense, half-mile-thick crust of crystalline metal will allow the pulsar to radiate gravitational waves. This scenario proposes that a jovian gas giant forms when, by gradual accretion of rock or ice, a solid planetary core has reached a critical mass of perhaps 10 M. The objects are most likely very primitive: detritus from the early accretion phases of the solar system. We are told that the earth formed by accretion of cosmic dust billions of years ago. We also need to know which clusters have experienced a recent substantial gravitational accretion of mass, and which clusters are in a stage of collision and merging. This energy input could have a profound effect on the evolution of the galaxy by triggering the formation of stars, or inhibiting the growth of the galaxy through accretion of matter from intergalactic space. Turns out, fortunately, that the steady and essentially unending accretion of interplanetary and intermoon particles may replenish the rings. All the planets should have started warm, when gravitational energy was transformed into heat during planetary accretion. The usual model for these events is that a white dwarf star is gaining mass by accretion from a companion. Before the Apollo samples became available, many planetary scientists had favored an early, intense bombardment associated with the late stages in the accretion of the planets. You just don't get giant rotating disks from the accretion of small galaxy fragments. These details support the theory that the two stars are close enough for accretion to take place and that the companion star is being cannibalised. So instead of joining into a single big object, asteroids began to strike each other at high speeds, several kilometres per second, often resulting in catastrophic fragmentation and disruption rather than accretion. The theory of core accretion supposes the collisional accumulation of solid bodies, the process that is universally accepted as the formation mechanism of the terrestrial planets. In yet another scenario, the so-called binary planet, or co-accretion, hypothesis, the Earth and the Moon all formed at the same time by the accretion of small bodies. Origin Early 17th century: from Latin accretio(n-), from accrescere ‘become larger’ (see accrete).
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