trigonometry Meaning, Definition & Usage

  1. noun the mathematics of triangles and trigonometric functions
    trig.

WordNet

Trig`o*nom"e*try noun
Etymology
Gr. a triangle + -metry: cf. F. trigonométrie. See Trigon.
Wordforms
plural -tries
Definitions
  1. That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.
  2. A treatise in this science.

Webster 1913