Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • preposition In approximately; about.

from The Century Dictionary.

  • About; at or near a date given, when the exact time is not known: as, circa a. d. 500. Abbreviated circ., ca., or c.

from the GNU version of the Collaborative International Dictionary of English.

  • preposition Approximately; about; commonly abbreviated ca.; -- used especially before dates and numerical measures.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • preposition approximately, about

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin circā, from circum, around (probably on the model of adverbs like intrā, within), from circus, circle; see circle.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin circa.

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