Pronunciation: (ē), [key]
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 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.


1. east.
2. eastern.
3. English.
4. excellent.
5. Expressway.


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.
a. the third tone in the scale of C major or the fifth tone in the relative minor scale, A minor.
b. a string, key, or pipe tuned to this tone.
c. a written or printed note representing this tone.
d. (in the fixed system of solmization) the third tone of the scale of C major, called mi.
e. the tonality having E as the tonic note.
4. (sometimes l.c.) the medieval Roman numeral for 250. Cf. Roman numerals.
5. Physics, Elect.
a. electric field.
b. electric field strength.
7. Biochem.See glutamic acid.
8. Logic.See universal negative.
9. a proportional shoe width size narrower than EE and wider than D.


1. electron.
2. Physics.elementary charge.


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.


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


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


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

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.



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