E
E1 / ē/ (also e) • n. (pl. Es or E's) 1. the fifth letter of the alphabet. ∎ denoting the fifth in a set of items, categories, sizes, etc. ∎ (e) Chess denoting the fifth file from the left, as viewed from White's side of the board. ∎ denoting the lowest-earning socioeconomic category for marketing purposes.2. (E) a shape like that of a capital E: [in comb.] an E-shaped stately home. 3. (usu. E) Mus. the third note of the diatonic scale of C major. ∎ a key based on a scale with E as its keynote.E2 • abbr. ∎ Earth. ∎ East or Eastern: 139° E. ∎ Easter. ∎ inf. the drug Ecstasy or a tablet of Ecstasy. ∎ engineer or engineering. ∎ English. ∎ [in comb.] (also e) electronic: E-commerce.• symb. Physics ∎ electric field strength. ∎ electromotive force. ∎ energy: E = mc2.E3 • symb. (₠) euro(s).
