e

e

e¹ or E [ē]

n.

pl. e's, E's

1. the fifth letter of the English alphabet: from the Greek epsilon, a borrowing from the Phoenician

2. any of the speech sounds that this letter represents, as, in English, the vowel (e) of bed or (ē) of equal, or, when unstressed, (ə) as in father

3. a type or impression for e or E

4. the fifth in a sequence or group

5. an object shaped like E

adj.

1. of e or E

2. fifth in a sequence or group

3. shaped like E

e² [ē]

n.

Math. the number used as the base of the system of natural logarithms, approximately 2.71828

e³

abbrev.

Physics electron