Main definitions of e in English

: e1E2E3

e1

  • 1"€"Euro or euros.

  • 2also "e−"Chemistry
    An electron.

  • 3"e"Mathematics
    The transcendental number that is the base of Napierian or natural logarithms, approximately equal to 2.71828.

Pronunciation

e

/iː/

Main definitions of e in English

: e1E2E3

E2

(also e)

noun

  • 1The fifth letter of the alphabet.

    1. 1.1 Denoting the fifth in a set of items, categories, sizes, etc.
    2. 1.2 The fifth-highest class of academic mark.
      ‘in O level about half of those entered obtained D or E grades’
    3. 1.3"e"Chess Denoting the fifth file from the left, as viewed from White's side of the board.
    4. 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.

    1. 3.1 A key based on a scale with E as its keynote.

Main definitions of e in English

: e1E2E3

E3

  • 1East or Eastern.

    ‘139° E’
  • 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).

Physics
  • 1Electric field strength.

  • 2Electromotive force.

  • 3Energy.

    ‘E = mc²’

Phrases

  • the three Es

    • Economy, efficiency, and effectiveness.

      ‘the research unit examines the effect of the three Es in the provision of social services’

Pronunciation

E

/iː/