trigonometric function

noun

Definition of trigonometric function 

1 : a function (such as the sine, cosine, tangent, cotangent, secant, or cosecant) of an arc or angle most simply expressed in terms of the ratios of pairs of sides of a right-angled triangle

called also circular function

2 : the inverse (such as the arcsine, arccosine, or arctangent) of a trigonometric function

First Known Use of trigonometric function

1909, in the meaning defined at sense 1

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The first known use of trigonometric function was in 1909

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