Anno Domini

in the year of our Lord (Latin phrase used to designate the years since the reputed date of the birth of Christ)

Anno Domini (), abbreviated as AD or A.D., defines an epoch based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth. AD is also an abbreviation for Christian Era. Similarly, Before Christ (from the Ancient Greek "Christos" or "Anointed One", referring to Jesus), abbreviated as BC or B.C., is used in the English language to denote years before the start of this epoch.
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Adverb
1. in the Christian era; used before dates after the supposed year Christ was born; "in AD 200"
(synonym) AD, A.D.

Anno Domini, AD, in the year of our Lord

adv. anno Domini, A.D., in the year of our Lord (Latin phrase used to designate the years since the reputed date of the birth of Christ)