Definition of circa preposition from the Oxford Advanced Learner's Dictionary

 

circa

 preposition
preposition
BrE BrE//ˈsɜːkə//
 
; NAmE NAmE//ˈsɜːrkə//
 
(from Latin)(abbreviation c)
 
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(used with dates) about born circa 150 BC Word Origin mid 19th cent.: Latin.
See the Oxford Advanced American Dictionary entry: circa