/ Dictionary / Index A alternating light: Meaning and Definition of Find definitions for: al'ternating light' Pronunciation: [key] — Navig. Navig. a beacon showing different colors in succession. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alternating group alternating series 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