cotangent Meaning, Definition & Usage

  1. noun ratio of the adjacent to the opposite side of a right-angled triangle
    cotan.

WordNet

Co*tan"gent noun
Etymology
For co. tangens, an abbrev. of L. complementi tangens. See Tangent.
Definitions
  1. (Trig.) The tangent of the complement of an arc or angle. See Illust. of Functions.

Webster 1913