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circa

preposition
 
 
/ˈsɜː.kə/ US  /ˈsɝː-/ (written abbreviation c, ca) formal

Definition

(used especially with years) approximately: He was born circa 1600.ApproximateYears and yearly
(Definition of circa preposition from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of circa