'Cotangent' definitions:
Definition of 'cotangent'
From: WordNet
noun
Ratio of the adjacent to the opposite side of a right- angled triangle [syn: cotangent, cotan]
Definition of 'Cotangent'
From: GCIDE
- Cotangent \Co*tan"gent\ (k?-t?n"jent), n. [For co. tangens, an abbrev. of L. complementi tangens. See Tangent.] (Trig.) The tangent of the complement of an arc or angle. See Illust. of Functions. [1913 Webster]