AD
abbreviation
or chiefly US
A.D.
or chiefly US
A.D.
Britannica Dictionary definition of AD
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used to refer to the years since the birth of Christ
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550 A.D. = A.D. 550
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the first century A.D.
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in the year 823 A.D.
◊ A.D. stands for the Latin phrase anno Domini, which means “in the year of the Lord.”
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compare b.c., b.c.e., c.e.
