/ Dictionary / Index C circa: Meaning and Definition of Find definitions for: cir•ca Pronunciation: (sûr'ku), [key] — prep., adv. about: (used esp. in) approximate dates:Abbr.: ca, ca., c., c, cir., circ. The Venerable Bede was born circa 673. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. circ circadian Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language