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Definition of A.D. abbreviation from the Oxford Advanced American Dictionary

 

A.D.

 abbreviation
(also AD) abbreviation
NAmE//ˌeɪ ˈdi//
 
 
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used in the Christian calendar to show a particular number of years since the year when Christ was believed to have been born (from LatinAnno Domini) in (the year) A.D. 55 in 55 A.D. in the fifth century A.D. compare A.H., B.C., B.C.E., C.E.