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e, E [iː] n pl e's, E's, Es 1. (Linguistics) the fifth letter and second vowel of the modern English alphabet 2. (Linguistics / Phonetics & Phonology) any of several speech sounds represented by this letter, in English as in he, bet, or below e symbol for 1. (Mathematics) Maths a transcendental number, fundamental to mathematics, that is the limit of (1 + 1/n)n as n increases to infinity: used as the base of natural logarithms. Approximate value: 2.718 282…; relation to π: eπi = -1, where i = √-1 2. (Physics / General Physics) electron 3. (Group Games / Chess & Draughts) Chess See algebraic notation E symbol for 1. (Engineering / Electrical Engineering) earth 2. East 3. English 4. Egypt(ian) 5. (Mathematics) exa- 6. (Music, other) Music a. a note having a frequency of 329.63 hertz (E above middle C) or this value multiplied or divided by any power of 2; the third note of the scale of C major b. a key, string, or pipe producing this note c. the major or minor key having this note as its tonic 7. (Physics / General Physics) Physics a. energy b. electric field strength c. electromotive force d. Young's modulus (of elasticity) 8. (Philosophy / Logic) Logic a universal negative categorical proposition, such as no pigs can fly: often symbolized as SeP Compare A, I2 O1 [from Latin (n)e(go) I deny] 9. (Social Welfare) a. a person without a regular income, or who is dependent on the state on a long-term basis because of unemployment, sickness, old age, etc. b. (as modifier) E worker See also occupation groupings 10. international car registration for Spain [(for sense 10) from Spanish España]
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