it comes from latin and it means "the year of the lord" thats why it is used to denote the timeline after jesus's birth...year ZERO if u want....everything before that is B.C (before christ)
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The letters AD stand for Anno Domini. The phrase Anno Domini is actually medieval Latin which means 'the year of Our Lord'.
"Year of our Lord".
Anno Domini and Before Christ
BC - Before Christ AD - Anno Domini
Anno Domini is from medieval Latin and means "In the year of our Lord". It is used to denote years in the Julian and Gregorian calendars.