Etymology
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Anno Domini

"in the year of the Christian era," 1570s, Latin, literally "in the year of (our) Lord," from ablative of annus "year" (see annual (adj.)) + Late Latin Domini, genitive of Dominus "the Lord" (see domain). Also see see A.D.

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Definitions of Anno Domini

anno Domini (adv.)
in the Christian era; used before dates after the supposed year Christ was born;
Synonyms: ad / A.D.
From wordnet.princeton.edu