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preposition, adverb
  1. about: (used especially in) approximate dates: The Venerable Bede was born circa 673. Abbreviation: ca, ca., c., c, cir., circ.

Origin of circa

1860–65; < Latin: around, about, akin to circus circus Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for circa

about, around, near, nearby, roughly, nigh

Examples from the Web for circa

Contemporary Examples of circa

Historical Examples of circa

British Dictionary definitions for circa


  1. (used with a date) at the approximate time ofcirca 1182 bc . Abbreviation: c., ca.

Word Origin for circa

Latin: about; related to Latin circus circle, circus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for circa

1856, from Latin circa "around, round about, near; in the region of; about the time of," alternative form of circum "round about" (see circum-).

Online Etymology Dictionary, © 2010 Douglas Harper

circa in Medicine


  1. In approximately; about.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.