F

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F1 / ef/ (also f) • n. (pl. Fs or F's) 1. the sixth letter of the alphabet. ∎  denoting the next after E in a set of items, categories, etc. ∎  the sixth highest or lowest class of academic marks (also used to represent “Fail”).2. (usu. F) Mus. the fourth note of the diatonic scale of C major. ∎  a key based on a scale with F as its keynote.F2 • abbr. ∎  Fahrenheit: 60°F. ∎  failure. ∎  false. ∎  farad(s). ∎  Chem. faraday(s). ∎  February. ∎  Fellow. ∎  female. ∎  fighter (in designations of U.S. aircraft types): the F117 Stealth fighter. ∎  forint. ∎  Franc(s). ∎  France. ∎  French.• symb. ∎  the chemical element fluorine. ∎ Physics force: F = ma.

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