Definition of: e, E

(ē) noun plural e's, E's or es, Es, ees (ēz)
1. The fifth letter of the English alphabet: from Phoenician he, through Hebrew he, Greek epsilon, and Roman E.
2. Any sound of the letter e. See ALPHABET.

—symbol
1. Music a The third tone in the natural scale of C, mi; the pitch of this tone, or the note representing it. b The scale built upon E.
2. Math. The limit of the expression (1 + 1/n)ⁿ, as n increases without limit: 2.7182818284+: the base to which Napierian logarithms are calculated: written e.