Anno Domini (A.D.)

in the Year of the Lord

Notes

Short for Anno Domini Nostri Iesu Christi (in the Year of Our Lord Jesus Christ), the predominantly used system for dating years across the world, used with the Gregorian calendar, and based on the perceived year of the birth of Jesus Christ. The years before Jesus' birth were once marked with a.C.n (Ante Christum Natum, Before Christ was Born), but now use the English abbreviation BC (Before Christ).