/ Dictionary / Index T trigonometric equation: Meaning and Definition of Find definitions for: trig'onomet'ric equa'tion Pronunciation: [key] — Math. Math. an equation involving trigonometric functions of unknown angles, as cos B = . Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trigone trigonometric function Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language