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circa

[sur-kuh]
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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.
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Origin of circa

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

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British Dictionary definitions for circa

circa

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

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

prep.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

circa in Medicine

circa

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