Meaning of “circa” in the English Dictionary

british dictionary

"circa" in British English

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circapreposition

uk /ˈsɜː.kə/ us /ˈsɝː.kə/ written abbreviation c, ca formal

(Definition of “circa” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"circa" in American English

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circapreposition

us /ˈsɜr·kə/ abbreviation c, abbreviation ca fml

(used before a year) about or approximately:

The Greek philosopher Socrates was born circa 470 BC.

(Definition of “circa” from the Cambridge Academic Content Dictionary © Cambridge University Press)