Definition of intrusion in English:

intrusion

noun ɪnˈtruːʒ(ə)nɪnˈtruʒən

mass noun

1The action of intruding.
侵入，闯入；打扰，侵扰
he was furious about this intrusion into his private life
对他私生活侵扰让他大为恼火。
count noun unacceptable intrusions of privacy
对个人隐私难以容忍的侵扰。
Example sentencesExamples
- I ask if tabloid intrusion into the personal lives of the famous has turned the judiciary against the press, which could make it easier for Establishment figures to hush up real scandals such as corruption.
- But each uptick in protection will typically come at the cost of more intrusion into the privacy of ordinary people.
- Would you be horrified at the intrusion into your privacy?
- He also hit out at what he called the excessive levels of intrusion into his private life that sections of the media had engaged in during the controversy.
- The issue split Republicans, many of whom saw it as government intrusion into an intensely private matter.
- Republicans who disagree with the federal intrusion into education, who have said they're waiting to complain until after the election, will likely speak up.
- In her book, Cheryl is a vociferous critic of her treatment by journalists, accusing us of relentless intrusion into her privacy.
- The ALA has made information available to librarians who opposed government intrusion into the privacy of library patrons.
- The Commons Culture, Media and Sport Committee, in a tougher than expected report on media intrusion into individuals' private lives, said action had to be taken.
- We in the UK hold certain freedoms sacred - freedom of speech, freedom of movement, freedom of religious belief, freedom from intrusion into our private lives.
- Where the law is restricting rights or expanding government intrusion into individual lives, the consequences will be the opposite.
- I never really knew a lot about her, only what the media dished out, and to tell you the truth I got tired of the relentless hounding and intrusion into her private life!
- More and more people realise the potential huge cost of the register and the great risk it poses of unnecessary manipulation of us all and intrusion into our lives by politicians and corrupt individuals.
- We are upset that our objections about this intrusion into the area have been ignored.
- Was he out there campaigning against the KGB for its intrusion into the privacy of the life of the average Soviet person?
- But government intrusion into private corporate matters will be strongly resisted.
- Liberals became increasingly confident as polls showed the public overwhelmingly concerned about federal intrusion into a private family matter.
- As he sees it, the aggression of tabloid journalism discourages potential candidates, who are fearful of the requisite intrusion into their private lives.
- No other Labour minister could have got away with challenging arranged marriages without being accused of unwarranted intrusion into the customs of Asian communities.
- The intrusion into personal privacy is compounded by the failure to limit access to the data held and its further use for purposes other than confirming a person's identity, he said.
Synonyms
encroachment on, trespass on, obtrusion into
invasion of, incursion into, violation of, interruption of, intervention in, interference with, disturbance of, disruption of, infringement of, impingement on
1. 1.1count noun A thing that intrudes.
  侵入物，闯入物，打扰物，侵扰物
  villagers say the noise is an intrusion on their lives
  Example sentencesExamples
  You tell me which is the bigger intrusion into the average American's liberty?
  In a column written for the Daily Nebraskan in September, Derek attacked seat belt laws as intrusions on individual liberties and expensive to enforce.
  Or maybe you worry it's just a step too far, an unwarranted, unworkable intrusion into your privacy.
  As if such intrusions can be dismissed as the doings of a cranky, ill-mannered boys, who don't really mean any permanent harm to the women they target.
  This is an intriguing document of the origins of one of the most influential intrusions on the British jazz scene since the Original Dixieland Jazz Band showed up in London in the 1920s.
  Two ideas are rejected: An article on wind chimes is out because they are sources of noise pollution and intrusions on personal space, and one on airline food - yuck!
  Our cities are awash in cars, so much so that we take their intrusions for granted - noise, dirt, smell and cost.
  Yet some prominent thinkers argue that patents and copyrights are unnecessary government intrusions in the market.
  In Rome the clutter of history elbowing the jowls of the modern seems overwhelming, in Venice - despite obvious historical layers and tourist-trap intrusions - it all seems made of one piece.
  Since this is invisible - since we don't have to actually hold the phone up so our software can speak - we mostly ignore these intrusions.
  Very attractive blue - green colour with variegated yellow intrusions, it is capable of taking a high polish showing to advantage the variety of grain and colour tones.
  Traffic generates noise and pollution, and is an intrusion for many areas.
  It was felt that vehicles parked on the land would present an ‘urban and unsightly intrusion into an attractive riverside location’.
  Perhaps it is just a change that parents go through, a time when the inward, nurturing view of the family is reshaped by the need to face the inevitable intrusions of the outside world.
  I feared the camp could not function with so many intrusions.
  In his painting of Kaaterskill Falls, for example, Cole obliterated with his brush the ugly intrusions of the already encroaching tourism.
  The Ministry of Defence have never seen fit to demolish any of these intrusions, preferring to let them stand as mute reminder of the days when war intruded on one of the most sublime places on earth.
2Geology
The action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface.
〔地质〕（火成岩）侵入
Example sentencesExamples
- The associated magmatism resulted in intrusion of volcanic rocks into the sedimentary basins, magmatic underplating at the base of the crust, and large amounts of extrusive material.
- Baked contacts with host rocks indicate that metamorphism associated with intrusion predates shearing.
- Lower amphibolite-grade regional metamorphism predating intrusion of the Ballachulish Igneous Complex may have resulted in some monazite growth.
- In both areas, the silicic magmatism is thought to have been a result of intrusion of mantle-derived mafic magmas into extending crust.
- Overthrusting, volcanism, and plutonic igneous intrusion were identified as originating above the subduction zone where one plate is forced beneath the edge of its neighbour.
1. 2.1count noun A body of igneous rock which has intruded the surrounding strata.
  （对周围岩层的）火成岩侵入
  Example sentencesExamples
  In addition, volcanic rocks and intrusions of this age are distributed widely around the western and southern perimeter of the basin.
  However, seismic interpretation within the saddle is rendered difficult by the presence of numerous magmatic intrusions in the Cretaceous section.
  Continental break-up produced voluminous extrusive volcanic deposits and associated igneous intrusions, and had a major impact on long-term climatic conditions in the early Tertiary.
  It comprises several mafic, mafic-felsic and felsic intrusions with distinctive geochemical affinities and apparent radiometric ages.
  Volcanic rocks of enormous thickness and deep-seated igneous intrusions from this period have created much of the geology of the Peruvian Andes.

Origin

Late Middle English (in the sense 'invasion, usurpation'): from medieval Latin intrusio(n-), from Latin intrudere 'thrust in' (see intrude).

Rhymes

allusion, collusion, conclusion, confusion, contusion, delusion, diffusion, effusion, exclusion, extrusion, fusion, illusion, inclusion, interfusion, obtrusion, occlusion, preclusion, profusion, prolusion, protrusion, reclusion, seclusion, suffusion, transfusion

Definition of intrusion in US English:

intrusion

nouninˈtro͞oZHənɪnˈtruʒən

1The action of intruding.
侵入，闯入；打扰，侵扰
he was furious about this intrusion into his private life
对他私生活侵扰让他大为恼火。
unacceptable intrusions of privacy
对个人隐私难以容忍的侵扰。
Example sentencesExamples
- No other Labour minister could have got away with challenging arranged marriages without being accused of unwarranted intrusion into the customs of Asian communities.
- But government intrusion into private corporate matters will be strongly resisted.
- We are upset that our objections about this intrusion into the area have been ignored.
- I ask if tabloid intrusion into the personal lives of the famous has turned the judiciary against the press, which could make it easier for Establishment figures to hush up real scandals such as corruption.
- The issue split Republicans, many of whom saw it as government intrusion into an intensely private matter.
- He also hit out at what he called the excessive levels of intrusion into his private life that sections of the media had engaged in during the controversy.
- Republicans who disagree with the federal intrusion into education, who have said they're waiting to complain until after the election, will likely speak up.
- The Commons Culture, Media and Sport Committee, in a tougher than expected report on media intrusion into individuals' private lives, said action had to be taken.
- In her book, Cheryl is a vociferous critic of her treatment by journalists, accusing us of relentless intrusion into her privacy.
- The ALA has made information available to librarians who opposed government intrusion into the privacy of library patrons.
- As he sees it, the aggression of tabloid journalism discourages potential candidates, who are fearful of the requisite intrusion into their private lives.
- Would you be horrified at the intrusion into your privacy?
- Where the law is restricting rights or expanding government intrusion into individual lives, the consequences will be the opposite.
- We in the UK hold certain freedoms sacred - freedom of speech, freedom of movement, freedom of religious belief, freedom from intrusion into our private lives.
- Liberals became increasingly confident as polls showed the public overwhelmingly concerned about federal intrusion into a private family matter.
- The intrusion into personal privacy is compounded by the failure to limit access to the data held and its further use for purposes other than confirming a person's identity, he said.
- Was he out there campaigning against the KGB for its intrusion into the privacy of the life of the average Soviet person?
- I never really knew a lot about her, only what the media dished out, and to tell you the truth I got tired of the relentless hounding and intrusion into her private life!
- But each uptick in protection will typically come at the cost of more intrusion into the privacy of ordinary people.
- More and more people realise the potential huge cost of the register and the great risk it poses of unnecessary manipulation of us all and intrusion into our lives by politicians and corrupt individuals.
Synonyms
encroachment on, trespass on, obtrusion into
1. 1.1 A thing that intrudes.
  侵入物，闯入物，打扰物，侵扰物
  they oppose the excavations as an intrusion on their heritage
  Example sentencesExamples
  In a column written for the Daily Nebraskan in September, Derek attacked seat belt laws as intrusions on individual liberties and expensive to enforce.
  Perhaps it is just a change that parents go through, a time when the inward, nurturing view of the family is reshaped by the need to face the inevitable intrusions of the outside world.
  Or maybe you worry it's just a step too far, an unwarranted, unworkable intrusion into your privacy.
  Two ideas are rejected: An article on wind chimes is out because they are sources of noise pollution and intrusions on personal space, and one on airline food - yuck!
  The Ministry of Defence have never seen fit to demolish any of these intrusions, preferring to let them stand as mute reminder of the days when war intruded on one of the most sublime places on earth.
  Since this is invisible - since we don't have to actually hold the phone up so our software can speak - we mostly ignore these intrusions.
  This is an intriguing document of the origins of one of the most influential intrusions on the British jazz scene since the Original Dixieland Jazz Band showed up in London in the 1920s.
  As if such intrusions can be dismissed as the doings of a cranky, ill-mannered boys, who don't really mean any permanent harm to the women they target.
  It was felt that vehicles parked on the land would present an ‘urban and unsightly intrusion into an attractive riverside location’.
  In his painting of Kaaterskill Falls, for example, Cole obliterated with his brush the ugly intrusions of the already encroaching tourism.
  You tell me which is the bigger intrusion into the average American's liberty?
  Traffic generates noise and pollution, and is an intrusion for many areas.
  Very attractive blue - green colour with variegated yellow intrusions, it is capable of taking a high polish showing to advantage the variety of grain and colour tones.
  In Rome the clutter of history elbowing the jowls of the modern seems overwhelming, in Venice - despite obvious historical layers and tourist-trap intrusions - it all seems made of one piece.
  I feared the camp could not function with so many intrusions.
  Our cities are awash in cars, so much so that we take their intrusions for granted - noise, dirt, smell and cost.
  Yet some prominent thinkers argue that patents and copyrights are unnecessary government intrusions in the market.
2Geology
The action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface.
〔地质〕（火成岩）侵入
Example sentencesExamples
- Overthrusting, volcanism, and plutonic igneous intrusion were identified as originating above the subduction zone where one plate is forced beneath the edge of its neighbour.
- In both areas, the silicic magmatism is thought to have been a result of intrusion of mantle-derived mafic magmas into extending crust.
- Lower amphibolite-grade regional metamorphism predating intrusion of the Ballachulish Igneous Complex may have resulted in some monazite growth.
- Baked contacts with host rocks indicate that metamorphism associated with intrusion predates shearing.
- The associated magmatism resulted in intrusion of volcanic rocks into the sedimentary basins, magmatic underplating at the base of the crust, and large amounts of extrusive material.
1. 2.1 A body of igneous rock which has intruded the surrounding strata.
  （对周围岩层的）火成岩侵入
  Example sentencesExamples
  Continental break-up produced voluminous extrusive volcanic deposits and associated igneous intrusions, and had a major impact on long-term climatic conditions in the early Tertiary.
  However, seismic interpretation within the saddle is rendered difficult by the presence of numerous magmatic intrusions in the Cretaceous section.
  Volcanic rocks of enormous thickness and deep-seated igneous intrusions from this period have created much of the geology of the Peruvian Andes.
  In addition, volcanic rocks and intrusions of this age are distributed widely around the western and southern perimeter of the basin.
  It comprises several mafic, mafic-felsic and felsic intrusions with distinctive geochemical affinities and apparent radiometric ages.

Origin

Late Middle English (in the sense ‘invasion, usurpation’): from medieval Latin intrusio(n-), from Latin intrudere ‘thrust in’ (see intrude).

词汇	intrusion
释义	Definition of intrusion in English: intrusion noun ɪnˈtruːʒ(ə)nɪnˈtruʒən mass noun 1The action of intruding. 侵入，闯入；打扰，侵扰 he was furious about this intrusion into his private life 对他私生活侵扰让他大为恼火。 count noun unacceptable intrusions of privacy 对个人隐私难以容忍的侵扰。 Example sentencesExamples I ask if tabloid intrusion into the personal lives of the famous has turned the judiciary against the press, which could make it easier for Establishment figures to hush up real scandals such as corruption. But each uptick in protection will typically come at the cost of more intrusion into the privacy of ordinary people. Would you be horrified at the intrusion into your privacy? He also hit out at what he called the excessive levels of intrusion into his private life that sections of the media had engaged in during the controversy. The issue split Republicans, many of whom saw it as government intrusion into an intensely private matter. Republicans who disagree with the federal intrusion into education, who have said they're waiting to complain until after the election, will likely speak up. In her book, Cheryl is a vociferous critic of her treatment by journalists, accusing us of relentless intrusion into her privacy. The ALA has made information available to librarians who opposed government intrusion into the privacy of library patrons. The Commons Culture, Media and Sport Committee, in a tougher than expected report on media intrusion into individuals' private lives, said action had to be taken. We in the UK hold certain freedoms sacred - freedom of speech, freedom of movement, freedom of religious belief, freedom from intrusion into our private lives. Where the law is restricting rights or expanding government intrusion into individual lives, the consequences will be the opposite. I never really knew a lot about her, only what the media dished out, and to tell you the truth I got tired of the relentless hounding and intrusion into her private life! More and more people realise the potential huge cost of the register and the great risk it poses of unnecessary manipulation of us all and intrusion into our lives by politicians and corrupt individuals. We are upset that our objections about this intrusion into the area have been ignored. Was he out there campaigning against the KGB for its intrusion into the privacy of the life of the average Soviet person? But government intrusion into private corporate matters will be strongly resisted. Liberals became increasingly confident as polls showed the public overwhelmingly concerned about federal intrusion into a private family matter. As he sees it, the aggression of tabloid journalism discourages potential candidates, who are fearful of the requisite intrusion into their private lives. No other Labour minister could have got away with challenging arranged marriages without being accused of unwarranted intrusion into the customs of Asian communities. The intrusion into personal privacy is compounded by the failure to limit access to the data held and its further use for purposes other than confirming a person's identity, he said. Synonyms encroachment on, trespass on, obtrusion into invasion of, incursion into, violation of, interruption of, intervention in, interference with, disturbance of, disruption of, infringement of, impingement on 1.1count noun A thing that intrudes. 侵入物，闯入物，打扰物，侵扰物 villagers say the noise is an intrusion on their lives Example sentencesExamples You tell me which is the bigger intrusion into the average American's liberty? In a column written for the Daily Nebraskan in September, Derek attacked seat belt laws as intrusions on individual liberties and expensive to enforce. Or maybe you worry it's just a step too far, an unwarranted, unworkable intrusion into your privacy. As if such intrusions can be dismissed as the doings of a cranky, ill-mannered boys, who don't really mean any permanent harm to the women they target. This is an intriguing document of the origins of one of the most influential intrusions on the British jazz scene since the Original Dixieland Jazz Band showed up in London in the 1920s. Two ideas are rejected: An article on wind chimes is out because they are sources of noise pollution and intrusions on personal space, and one on airline food - yuck! Our cities are awash in cars, so much so that we take their intrusions for granted - noise, dirt, smell and cost. Yet some prominent thinkers argue that patents and copyrights are unnecessary government intrusions in the market. In Rome the clutter of history elbowing the jowls of the modern seems overwhelming, in Venice - despite obvious historical layers and tourist-trap intrusions - it all seems made of one piece. Since this is invisible - since we don't have to actually hold the phone up so our software can speak - we mostly ignore these intrusions. Very attractive blue - green colour with variegated yellow intrusions, it is capable of taking a high polish showing to advantage the variety of grain and colour tones. Traffic generates noise and pollution, and is an intrusion for many areas. It was felt that vehicles parked on the land would present an ‘urban and unsightly intrusion into an attractive riverside location’. Perhaps it is just a change that parents go through, a time when the inward, nurturing view of the family is reshaped by the need to face the inevitable intrusions of the outside world. I feared the camp could not function with so many intrusions. In his painting of Kaaterskill Falls, for example, Cole obliterated with his brush the ugly intrusions of the already encroaching tourism. The Ministry of Defence have never seen fit to demolish any of these intrusions, preferring to let them stand as mute reminder of the days when war intruded on one of the most sublime places on earth. 2Geology The action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface. 〔地质〕（火成岩）侵入 Example sentencesExamples The associated magmatism resulted in intrusion of volcanic rocks into the sedimentary basins, magmatic underplating at the base of the crust, and large amounts of extrusive material. Baked contacts with host rocks indicate that metamorphism associated with intrusion predates shearing. Lower amphibolite-grade regional metamorphism predating intrusion of the Ballachulish Igneous Complex may have resulted in some monazite growth. In both areas, the silicic magmatism is thought to have been a result of intrusion of mantle-derived mafic magmas into extending crust. Overthrusting, volcanism, and plutonic igneous intrusion were identified as originating above the subduction zone where one plate is forced beneath the edge of its neighbour. 2.1count noun A body of igneous rock which has intruded the surrounding strata. （对周围岩层的）火成岩侵入 Example sentencesExamples In addition, volcanic rocks and intrusions of this age are distributed widely around the western and southern perimeter of the basin. However, seismic interpretation within the saddle is rendered difficult by the presence of numerous magmatic intrusions in the Cretaceous section. Continental break-up produced voluminous extrusive volcanic deposits and associated igneous intrusions, and had a major impact on long-term climatic conditions in the early Tertiary. It comprises several mafic, mafic-felsic and felsic intrusions with distinctive geochemical affinities and apparent radiometric ages. Volcanic rocks of enormous thickness and deep-seated igneous intrusions from this period have created much of the geology of the Peruvian Andes. Origin Late Middle English (in the sense 'invasion, usurpation'): from medieval Latin intrusio(n-), from Latin intrudere 'thrust in' (see intrude). Rhymes allusion, collusion, conclusion, confusion, contusion, delusion, diffusion, effusion, exclusion, extrusion, fusion, illusion, inclusion, interfusion, obtrusion, occlusion, preclusion, profusion, prolusion, protrusion, reclusion, seclusion, suffusion, transfusion Definition of intrusion in US English: intrusion nouninˈtro͞oZHənɪnˈtruʒən 1The action of intruding. 侵入，闯入；打扰，侵扰 he was furious about this intrusion into his private life 对他私生活侵扰让他大为恼火。 unacceptable intrusions of privacy 对个人隐私难以容忍的侵扰。 Example sentencesExamples No other Labour minister could have got away with challenging arranged marriages without being accused of unwarranted intrusion into the customs of Asian communities. But government intrusion into private corporate matters will be strongly resisted. We are upset that our objections about this intrusion into the area have been ignored. I ask if tabloid intrusion into the personal lives of the famous has turned the judiciary against the press, which could make it easier for Establishment figures to hush up real scandals such as corruption. The issue split Republicans, many of whom saw it as government intrusion into an intensely private matter. He also hit out at what he called the excessive levels of intrusion into his private life that sections of the media had engaged in during the controversy. Republicans who disagree with the federal intrusion into education, who have said they're waiting to complain until after the election, will likely speak up. The Commons Culture, Media and Sport Committee, in a tougher than expected report on media intrusion into individuals' private lives, said action had to be taken. In her book, Cheryl is a vociferous critic of her treatment by journalists, accusing us of relentless intrusion into her privacy. The ALA has made information available to librarians who opposed government intrusion into the privacy of library patrons. As he sees it, the aggression of tabloid journalism discourages potential candidates, who are fearful of the requisite intrusion into their private lives. Would you be horrified at the intrusion into your privacy? Where the law is restricting rights or expanding government intrusion into individual lives, the consequences will be the opposite. We in the UK hold certain freedoms sacred - freedom of speech, freedom of movement, freedom of religious belief, freedom from intrusion into our private lives. Liberals became increasingly confident as polls showed the public overwhelmingly concerned about federal intrusion into a private family matter. The intrusion into personal privacy is compounded by the failure to limit access to the data held and its further use for purposes other than confirming a person's identity, he said. Was he out there campaigning against the KGB for its intrusion into the privacy of the life of the average Soviet person? I never really knew a lot about her, only what the media dished out, and to tell you the truth I got tired of the relentless hounding and intrusion into her private life! But each uptick in protection will typically come at the cost of more intrusion into the privacy of ordinary people. More and more people realise the potential huge cost of the register and the great risk it poses of unnecessary manipulation of us all and intrusion into our lives by politicians and corrupt individuals. Synonyms encroachment on, trespass on, obtrusion into 1.1 A thing that intrudes. 侵入物，闯入物，打扰物，侵扰物 they oppose the excavations as an intrusion on their heritage Example sentencesExamples In a column written for the Daily Nebraskan in September, Derek attacked seat belt laws as intrusions on individual liberties and expensive to enforce. Perhaps it is just a change that parents go through, a time when the inward, nurturing view of the family is reshaped by the need to face the inevitable intrusions of the outside world. Or maybe you worry it's just a step too far, an unwarranted, unworkable intrusion into your privacy. Two ideas are rejected: An article on wind chimes is out because they are sources of noise pollution and intrusions on personal space, and one on airline food - yuck! The Ministry of Defence have never seen fit to demolish any of these intrusions, preferring to let them stand as mute reminder of the days when war intruded on one of the most sublime places on earth. Since this is invisible - since we don't have to actually hold the phone up so our software can speak - we mostly ignore these intrusions. This is an intriguing document of the origins of one of the most influential intrusions on the British jazz scene since the Original Dixieland Jazz Band showed up in London in the 1920s. As if such intrusions can be dismissed as the doings of a cranky, ill-mannered boys, who don't really mean any permanent harm to the women they target. It was felt that vehicles parked on the land would present an ‘urban and unsightly intrusion into an attractive riverside location’. In his painting of Kaaterskill Falls, for example, Cole obliterated with his brush the ugly intrusions of the already encroaching tourism. You tell me which is the bigger intrusion into the average American's liberty? Traffic generates noise and pollution, and is an intrusion for many areas. Very attractive blue - green colour with variegated yellow intrusions, it is capable of taking a high polish showing to advantage the variety of grain and colour tones. In Rome the clutter of history elbowing the jowls of the modern seems overwhelming, in Venice - despite obvious historical layers and tourist-trap intrusions - it all seems made of one piece. I feared the camp could not function with so many intrusions. Our cities are awash in cars, so much so that we take their intrusions for granted - noise, dirt, smell and cost. Yet some prominent thinkers argue that patents and copyrights are unnecessary government intrusions in the market. 2Geology The action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface. 〔地质〕（火成岩）侵入 Example sentencesExamples Overthrusting, volcanism, and plutonic igneous intrusion were identified as originating above the subduction zone where one plate is forced beneath the edge of its neighbour. In both areas, the silicic magmatism is thought to have been a result of intrusion of mantle-derived mafic magmas into extending crust. Lower amphibolite-grade regional metamorphism predating intrusion of the Ballachulish Igneous Complex may have resulted in some monazite growth. Baked contacts with host rocks indicate that metamorphism associated with intrusion predates shearing. The associated magmatism resulted in intrusion of volcanic rocks into the sedimentary basins, magmatic underplating at the base of the crust, and large amounts of extrusive material. 2.1 A body of igneous rock which has intruded the surrounding strata. （对周围岩层的）火成岩侵入 Example sentencesExamples Continental break-up produced voluminous extrusive volcanic deposits and associated igneous intrusions, and had a major impact on long-term climatic conditions in the early Tertiary. However, seismic interpretation within the saddle is rendered difficult by the presence of numerous magmatic intrusions in the Cretaceous section. Volcanic rocks of enormous thickness and deep-seated igneous intrusions from this period have created much of the geology of the Peruvian Andes. In addition, volcanic rocks and intrusions of this age are distributed widely around the western and southern perimeter of the basin. It comprises several mafic, mafic-felsic and felsic intrusions with distinctive geochemical affinities and apparent radiometric ages. Origin Late Middle English (in the sense ‘invasion, usurpation’): from medieval Latin intrusio(n-), from Latin intrudere ‘thrust in’ (see intrude).
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