trigonometric function WORD ORIGIN noun Mathematics. Also called. a function of an angle, as sine or cosine, expressed as the ratio of the sides of a right triangle. any function involving only trigonometric functions and constants. the generalization of these to functions of real or complex numbers.
Origin of trigonometric function First recorded in 1905–10 Also called trig function (for defs 1, 2). Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 British Dictionary definitions for trig function trigonometric function noun Also called: circular function any of a group of functions of an angle expressed as a ratio of two of the sides of a right-angled triangle containing the angle. The group includes sine, cosine, tangent, secant, cosecant, and cotangent any function containing only sines, cosines, etc, and constants Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 trig function in Science trigonometric function [trĭg′ə-nə-mĕt′rĭk] A function of an angle, as the sine, cosine, or tangent, whose value is expressed as a ratio of two of the sides of the right triangle that contains the angle. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.