Wiktionary
trigonometric function
n. (context trigonometry English) Any function of an angle expressed as the ratio of two of the sides of a right triangle that has that angle, or various other functions that subtract 1 from this value or subtract this value from 1 (such as the versed sine)
WordNet
trigonometric function
n. function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle [syn: circular function]