Definition of B.C. abbreviation from the Oxford Advanced American Dictionary

 

B.C.

 abbreviation
(also BC)abbreviation
NAmE//ˌbi ˈsi//
 
 
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before Christ(used in the Christian calendar to show a particular number of years before the year when Christ is believed to have been born) in (the year) 2,000 B.C. the third century B.C. compare A.D., A.H., B.C.E., C.E.