/ Dictionary / Index I infinite series: Meaning and Definition of Find definitions for: in'finite se'ries Pronunciation: [key] — Math. Math. a sequence of numbers in which an infinite number of terms are added successively in a given pattern; the sequence of partial sums of a given sequence. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. infinite regress infinitesimal Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language