Circa

google

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mid 19th century: Latin.

wiktionary

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Borrowed from Latin circa.

etymonline

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circa (adv.)

"about, at or near (a given date)" when the exact time is unknown, 1856, from Latin circa (adv., prep.) "around, round about, near; in the region of; about the time of," alternative form of circum "round about" (see circum-).