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• e
  e

  abbreviation

  electron.
• E
  E

  noun

  the fifth letter of the English alphabet, a vowel.
• e-
  e-

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

  abbreviation

  eldest.
• E.
  E.

  abbreviation

  Earl.
• E-
  E-

  prefix

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

e

¹ American  

abbreviation

1. electron.

2. Physics. elementary charge.

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e ² American  

Symbol.

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.

2. Logic. universal negative.

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E ³ American  

[ee] / i /

Or e

noun

E's, plural Es, plural e's, plural es plural

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.

3. something having the shape of an E .

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

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

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E ⁴ American  

abbreviation

1. east.

2. eastern.

3. English.

4. excellent.

5. Expressway.

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E ⁵ American  

Symbol.

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.

3. Music.

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

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

   3. a written or printed note representing this tone.

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

   5. the tonality having E as the tonic note.

4. (sometimes lowercase) the medieval Roman numeral for 250.

5. Physics, Electricity.

   1. electric field

   2. electric field strength.

6. Physics. energy.

7. Biochemistry. glutamic acid.

8. Logic. universal negative.

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

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e- ⁶ American  

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

   emit.

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e- ⁷ American  

Sometimes E-

1. electric.

   e-bike.

2. electronic.

   e-book;

   e-cigarette.

3. on the internet; online.

   e-content;

   e-commerce.

4. involving electronic data transfer, especially over the internet.

   e-banking.

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e. ⁸ American  

abbreviation

1. eldest.

2. Football. end.

3. engineer.

4. engineering.

5. entrance.

6. Baseball. error; errors.

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E. ⁹ American  

abbreviation

1. Earl.

2. Earth.

3. east.

4. Easter.

5. eastern.

6. engineer.

7. engineering.

8. English.

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e ¹ British  

symbol

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

3. chess See algebraic notation

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E- ² British  

prefix

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

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e- ³ British  

prefix

1. electronic, indicating the involvement of the internet

   e-business

   e-money

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E. ⁴ British  

abbreviation

1. Earl

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e- ⁵ British  

prefix

1. out

   eviscerate

   egest

2. away

   elapse

   elongate

3. outside

   evaginate

4. completely

   evaporate

5. without

   ebracteate

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e ⁶ British  

/ iː /

noun

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

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E ⁷ British  

symbol

1. earth

2. East

3. English

4. Egypt(ian)

5. exa-

6. music

   1. 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

   2. a key, string, or pipe producing this note

   3. the major or minor key having this note as its tonic

7. physics

   1. energy

   2. electric field strength

   3. electromotive force

   4. Young's modulus (of elasticity)

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

9. 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

   2. ( as modifier ) See also occupation groupings

      E worker

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abbreviation

1. Spain (international car registration)

2. informal the drug ecstasy

e Scientific  

/ ē /

1. An irrational number, with a numerical value of 2.718281828459…. It is mathematically defined as the limit of (1 + 1/n) 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.

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e- Cultural  

1. 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.

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Other Word Forms

Noun Inflected Forms

• E's
  plural
• Es
  plural
• e's
  plural
• es
  plural

Etymology

Origin of e-

First recorded in 1985–90; shortening of electronic ( def. )

Example Sentences

Fatboy Slim will perform an exclusive DJ set at The Pipeline in Brighton, external, where the capacity is just 60 people; while grime legend D Double E plays a warehouse gig at Nottingham's Brickworks.

From BBC • Jun. 25, 2026

Curacao and Ivory Coast have both lost to a full-strength Germany in Group E.

From BBC • Jun. 23, 2026

It’s part of a wider plan to connect the E Line to the city of Whittier, though officials say the work will be built in two phases due to funding constraints.

From Los Angeles Times • Jun. 19, 2026

The 4.7-mile extension of the Metro E Line would connect East Los Angeles to Montebello with four new stations.

From Los Angeles Times • Jun. 19, 2026

Just be ready when I get there, bee I can’t leave E Motions unattended!

From "Maybe He Just Likes You" by Barbara Dee