Circa
来自Big Physics
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mid 19th century: Latin.
wiktionary
Borrowed from Latin circa.
etymonline
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-).
