trigonometric series noun Mathematics. an infinite series involving sines and cosines of increasing integral multiples of a variable. Liberaldictionary.com Is It Time For All Couples To Use The Term Partner? Can You Translate These Famous Phrases From Emoji? These Are the Longest Words in English These Are the Saddest Phrases in English Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019