noun Etymology: New Latin cosinus, from co- + Medieval Latin sinus sine Date: 1635 1. a trigonometric function that for an acute angle is the ratio between the leg adjacent to the angle when it is considered part of a right triangle and the hypotenuse 2. a trigonometric function cos θ that for all real numbers θ is given by the sum of the alternating series cos θ = 1 - θ2/2! + θ4/4! - θ6/6! + θ8/8! - . . . and that is exactly equal to the cosine of an angle of measure θ in radians

New Collegiate Dictionary. 2001.

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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

  • COSINE — (Cooperation for OSI In Europe) co·sine || kəʊsaɪn European program to increase use of open communications networks in order to connect between European research organizations …   English contemporary dictionary

  • cosine — ► NOUN Mathematics ▪ (in a right angled triangle) the ratio of the side adjacent to a particular acute angle to the hypotenuse …   English terms dictionary

  • cosine — UK [ˈkəʊˌsaɪn] / US [ˈkoʊˌsaɪn] noun [countable] Word forms cosine : singular cosine plural cosines maths in a right angled triangle, the measurement of an acute angle that is equal to the length of the side between the angle and the right angle… …   English dictionary

  • cosine — /koh suyn/, n. 1. Trigonom. 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 2. Math. (of a real or complex number x) the function cos x… …   Universalium

  • cosine — noun /ˈkəʊ.saɪn,ˈkoʊ.saɪn/ a) In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos <!These definitions are equivalent to the one above and so do not …   Wiktionary

  • COSINE — Cooperation for OSI Networking in Europe (Computing » General) …   Abbreviations dictionary

  • COSINE — EUREKA Projekt EU 8 Cooperation for Open Systems Interconnection Networking in Europe Vernetzung von Rechenanlagen von Hochschulen sowie von staatlichen und industriellen Forschungseinrichtungen mittels öffentlicher Fernmeldenetze unter… …   Acronyms

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