[[t]ˈkoʊ saɪn[/t]] n.
a) (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse
b) the sine of the complement of a given angle or arc
Abbr.: cos
Etymology: 1625–35; < NL cosinus. See co-, sine

From formal English to slang. 2014.

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  • cosine — [kō′sīn΄] n. [ModL < co. sinus, short for complementi sinus, lit., sine of the complement] Trigonometry the reciprocal of the secant; specif. a) the ratio of the adjacent side of a given acute angle in a right triangle to the hypotenuse: see… …   English World dictionary

  • Cosine — Co sine (k? s?n), n. [For co. sinus, an abbrev. of L. complementi sinus.] (Trig.) The sine of the complement of an arc or angle. See Illust. of {Functions}. [1913 Webster] …   The Collaborative International Dictionary of English

  • cosine — 1630s, from co. sinus, abbreviation of M.L. complementi sinus (see COMPLEMENT (Cf. complement) + SINE (Cf. sine)) …   Etymology dictionary

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