e-

UK: /ˈiː/

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- prefix

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

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.

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