/ Dictionary / Index C circular light: Meaning and Definition of Find definitions for: cir'cular light' Pronunciation: [key] — Optics. Optics. light that is circularly polarized. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. circular knitting circular measure Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language