iːi
2also "e−"Chemistry
An electron.
〔化〕电子
3"e"Mathematics
The transcendental number that is the base of Napierian or natural logarithms, approximately equal to 2.71828.
〔数〕自然对数的超越数（约为2.71828）
abbreviationiː
2informal The drug Ecstasy or a tablet of Ecstasy.
people have died after taking E
being busted with three Es can lead to stiff penalties
3in combination Denoting products, in particular food additives, which comply with EU regulations.
the yellow colouring tartrazine (E 102)
See also E-number
4in combination (in units of measurement) exa- (10¹⁸).
5Spain (international vehicle registration).
nounPlural E's, Plural Es, Plural esiː
1The fifth letter of the alphabet.
- 1.1 Denoting the fifth in a set of items, categories, sizes, etc.
- 1.2 The fifth-highest class of academic mark.
in O level about half of those entered obtained D or E grades
- 1.3"e"Chess Denoting the fifth file from the left, as viewed from White's side of the board.
- 1.4 Denoting the lowest-earning socio-economic category for marketing purposes.
2"E"A shape like that of a capital E.
in combination an E-shaped stately home
3"E"Music
The third note of the diatonic scale of C major.
- 3.1 A key based on a scale with E as its keynote.
iːi
Physics 1Electric field strength.
Phrases
Economy, efficiency, and effectiveness.
the research unit examines the effect of the three Es in the provision of social services