- (of an angle) a trigonometric function that in a right-angled triangle is the ratio of the length of the adjacent side to that of the opposite side; the reciprocal of tangent
WordReference Random House Unabridged Dictionary of American English © 2017
- Mathematics(in a right triangle) the ratio of the side adjacent to a given angle to the side opposite.
- Mathematicsthe tangent of the complement, or the reciprocal of the tangent, of a given angle or arc. Abbr.: cot, ctn
- Neo-Latin cotangent- (stem of cotangēns). See co-, tangent