e1
/iː
/symbol
1 (€) Euro or euros.
2 (also e−) Chemistry An electron.
3 (e) Mathematics The transcendental number that is the base of Napierian or natural logarithms, approximately equal to 2.71828.
E2
/iː/(also e)
noun (plural Es or E's)
1The fifth letter of the alphabet.
1.1Denoting the fifth in a set of items, categories, sizes, etc.
1.2The 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.
1.4Denoting 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.
3.1A key based on a scale with E as its keynote.
E3
/iː/abbreviation
1East or Eastern: 139° E
2 informal The drug Ecstasy or a tablet of Ecstasy: people have died after taking E being busted with three Es can lead to stiff penalties
3 [in combination] Denoting products, in particular food additives, which comply with EU regulations: the yellow colouring tartrazine (E 102) See also E-number.
4 [in combination] (In units of measurement) exa- (1018).
5Spain (international vehicle registration).
From Spanish España
symbol Physics
1Electric field strength.
2Electromotive force.
3Energy: E = mc2
Phrases
the three Es
E4
/ē
/symbol
(€) Euro(s).
e-5
/iː/prefix
Denoting something in electronic form, especially the use of electronic data transfer for information exchange and financial transactions via the Internet: e-cash e-business e-zine
Origin
From electronic, on the pattern of email.