/ Dictionary / Index T trigonometric series: Meaning and Definition of Find definitions for: trig'onomet'ric se'ries Pronunciation: [key] — Math. Math. an infinite series involving sines and cosines of increasing integral multiples of a variable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trigonometric function trigonometry 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