1. Physics. elementary charge.

Other definitions for e (2 of 9)


  1. Mathematics. a transcendental constant equal to 2.7182818 …, used as the base of natural logarithms; the limit of the expression (1+1/n)n as n approaches infinity.

Other definitions for E (3 of 9)


or e

[ ee ]

noun,plural E's or Es, e's or es.
  1. the fifth letter of the English alphabet, a vowel.

  2. any spoken sound represented by the letter E or e, as in met, meet, mere, etc.

  1. something having the shape of an E.

  2. a written or printed representation of the letter E or e.

  3. a device, as a printer's type, for reproducing the letter E or e.

Other definitions for E (4 of 9)


  1. east.

  2. eastern.

  1. excellent.

  2. Expressway.

Other definitions for E (5 of 9)


  1. the fifth in order or in a series.

  2. (sometimes lowercase) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student's work is in need of improvement in order to be passing.

  1. Music.

    • the third tone in the scale of C major or the fifth tone in the relative minor scale, A minor.

    • a string, key, or pipe tuned to this tone.

    • a written or printed note representing this tone.

    • (in the fixed system of solmization) the third tone of the scale of C major, called mi.

    • the tonality having E as the tonic note.

  2. (sometimes lowercase) the medieval Roman numeral for 250.: Compare Roman numerals.

  3. Physics, Electricity.

  4. Physics. energy (def. 8).

  5. Biochemistry. glutamic acid.

  6. a proportional shoe width size narrower than EE and wider than D.

Other definitions for e- (6 of 9)


  1. variant of ex-1 occurring in words of Latin origin before consonants other than c, f, p, q, s, and t:: emit.

Other definitions for e- (7 of 9)


(used in combination)
  1. electric: e-bike.

  2. electronic: e-book; e-cigarette.

  1. on the internet; online: e-content; e-commerce.

  2. involving electronic data transfer, especially over the internet: e-banking.

Origin of e-

First recorded in 1985–90; shortening of electronic
  • Sometimes E- .

word story For e-

Other definitions for e. (8 of 9)


  1. eldest.

  2. Football. end.

  1. engineer.

  2. engineering.

  3. entrance.

  4. Baseball. error; errors.

Other definitions for E. (9 of 9)


  1. Earl.

  2. Earth.

  1. east.

  2. Easter.

  3. eastern.

  4. engineer.

  5. engineering.

  6. English.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use e in a sentence

British Dictionary definitions for e (1 of 7)



/ () /

nounplural e's, E's or Es
  1. the fifth letter and second vowel of the modern English alphabet

  2. any of several speech sounds represented by this letter, in English as in he, bet, or below

British Dictionary definitions for e (2 of 7)


symbol for
  1. maths a transcendental number, fundamental to mathematics, that is the limit of (1 + 1 /n) n as n increases to infinity: used as the base of natural logarithms. Approximate value: 2.718 282…; relation to π: e πi = –1, where i = √–1

  2. electron

British Dictionary definitions for E (3 of 7)


symbol for
  1. earth

  2. East

  1. English

  2. Egypt(ian)

  3. exa-

  4. music

    • a note having a frequency of 329.63 hertz (E above middle C) or this value multiplied or divided by any power of 2; the third note of the scale of C major

    • a key, string, or pipe producing this note

    • the major or minor key having this note as its tonic

  5. physics

    • energy

    • electric field strength

    • electromotive force

    • Young's modulus (of elasticity)

  6. logic a universal negative categorical proposition, such as no pigs can fly: often symbolized as SeP: Compare A, I 2, O 1

    • a person without a regular income, or who is dependent on the state on a long-term basis because of unemployment, sickness, old age, etc

    • (as modifier): E worker See also occupation groupings

abbreviation for
  1. Spain (international car registration)

  2. informal the drug ecstasy

Origin of E

(sense 8) from Latin (n) e (go) I deny (sense 10) from Spanish España

British Dictionary definitions for e- (4 of 7)


prefix forming verbs and verbal derivatives
  1. out: eviscerate; egest

  2. away: elapse; elongate

  1. outside: evaginate

  2. completely: evaporate

  3. without: ebracteate

Origin of e-

from Latin ē away; related to ex- 1

British Dictionary definitions for e- (5 of 7)


  1. electronic, indicating the involvement of the internet: e-business; e-money

British Dictionary definitions for E- (6 of 7)


  1. used with numbers indicating a standardized system within the European Union, as of recognized food additives or standard pack sizes: See also E number

British Dictionary definitions for E. (7 of 7)


abbreviation for
  1. Earl

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for e (1 of 2)


[ ē ]

  1. An irrational number, with a numerical value of 2.718281828459.... It is mathematically defined as the limit of (1 + 1n)n as n grows infinitely large. It is the base of natural logarithms and has many applications in mathematics, especially in expressions involving exponential growth and decay.

Scientific definitions for E (2 of 2)


The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for e-


A prefix that stands for “electronic” and refers to information technologies, business, and almost anything connected to or transmitted over the Internet. Some examples of its use include e-business, e-commerce, e-book, and e-mail.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.