COTANGENT

cotangent, cotan

(noun) ratio of the adjacent to the opposite side of a right-angled triangle

Source: WordNet® 3.1

cotangent (plural cotangents)

(trigonometry) In a right triangle, the reciprocal of the tangent of an angle. Symbols: cot, ctg, or ctn

Source: Wiktionary

Co*tan"gent (k-tn"jent), n. Etym: [For co. tangens, an abbrev. of L. complementi tangens. See Tangent.] (Trig.)

Definition: The tangent of the complement of an arc or angle. See Illust. of Functions.

Source: Webster’s Unabridged Dictionary 1913 Edition

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