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Catholic Dictionary

Term

ANNO DOMINI

Definition

In the year of our Lord. Abbreviated A.D., it is based on the supposed year of Christ's birth devised by Dionysius Exiguus (d. 550). Modern scholarship agrees that the actual birth was several years earlier, either between 7 and 4 B.C., based on the death of Herod the Great (Matthew 2:19) in 4 B.C., or at A.D. 6, based on the great taxation under Quirinius (Luke 2:1-2).