Definitions

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

  • prep. In approximately; about: born circa 1900.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • prep. approximately, about

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

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

Etymologies

Latin circā, from circum, around (probably on the model of adverbs like intrā, within), from circus, circle; see circle.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin circa. (Wiktionary)

Examples

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