/ Dictionary / Index A alternating series: Meaning and Definition of Find definitions for: al'ternating se'ries Pronunciation: [key] — Math. Math. a series, usually infinite, in which successive terms have opposite signs, as 1 − + − + . … Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alternating light alternating voltage Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language