E

UK: 'E', 'e': /ˈiː/ US: 'E', 'e': /i/ ,'E', 'e': (ē)

Collins Concise English Dictionary © HarperCollins Publishers::

E symbol

1. earth
2. East
3. English
4. Egypt(ian)
5. exa-
6. 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
7. the major or minor key having this note as its tonic
8. energy
9. electromotive force
10. a universal negative categorical proposition, such as no pigs can fly: often symbolized as SeP
    Compare A, I2, O1
11. 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
12. (as modifier): E worker
    See also occupation groupings

abbreviation

1. the drug ecstasy

WordReference Random House Learner's Dictionary of American English © 2026

E, e /i/   n. [countable] , pl. Es or E's, es or e's. 

1. Linguistics the fifth letter of the English alphabet, a vowel.

E.,  an abbreviation of:

1. Geography Earth.
2. Geography east.
3. eastern.
4. engineering.

WordReference Random House Unabridged Dictionary of American English © 2026

E, e  (ē), n., pl. 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.
3. something having the shape of anE.
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.

E, 

1. Geography east.
2. Education eastern.
3. Music and Dance English.
4. excellent.
5. Expressway.

E,  Symbol.

1. the fifth in order or in a series.
2. (sometimes l.c.) (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.]
   • 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.
4. (sometimes l.c.) the medieval Roman numeral for 250. Cf. Roman numerals.
5. [Physics, Elect.]
   • electric field.
   • electric field strength.
6. [Physics.] energy.
7. [Biochem.] See glutamic acid. 
8. Philosophy [Logic.] See universal negative. 
9. Clothing a proportional shoe width size narrower than EE and wider than D.

e, 

1. Physics electron.
2. Physics, Philosophy elementary charge.

e, Symbol.

1. [Math.] 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.] See universal negative. 

e-, 

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

E., 

1. Earl.
2. Earth.
3. Geography east.
4. Easter.
5. eastern.
6. engineer.
7. engineering.
8. English.

e., 

1. eldest.
2. Sport [Football.] end.
3. engineer.
4. engineering.
5. entrance.
6. Sport [Baseball.] error;
   errors.

WordReference Random House Unabridged Dictionary of American English © 2026

e-,¹ (used in combination)

1. Computing electronic:
   e-mail, E-text.
2. Computing on-line:
   e-commerce.

Also, E-. 

Collins Concise English Dictionary © HarperCollins Publishers::

e, E / iː/ noun (e's, E's, 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

e symbol

1. 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

Collins Concise English Dictionary © HarperCollins Publishers::

E- 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

Collins Concise English Dictionary © HarperCollins Publishers::

E. abbreviation

1. Earl

Collins Concise English Dictionary © HarperCollins Publishers::

e- prefix

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