in the Christian era; used before dates after the supposed year Christ was born“in AD 200”Synonyms: ADA.D.
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Webster's Dictionary (GCIDE)
Anno Domini \An"no Dom"i*ni\ [L., in the year of [our] Lord [Jesus Christ]; usually abbrev. a. d.] In the year of the Christian era; as, a. d. 1887. [1913 Webster]