Anno Domini

adverb1

1. •
   In the year of our Lord (often abbreviated A.D. or AD).

   • The scene was Mr. Cruncher’s private lodging in Hanging-sword-alley, Whitefriars: the time, half-past seven of the clock on a windy March morning, Anno Domini seventeen hundred and eighty. — 1859

noun1

1. •
   The current date era beginning approximately 2000 years ago in the Gregorian calendar, based on the birth of Jesus Christ.