E

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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).

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