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A.D.
Anno Domini (in the year of the Lord) which refers to years dated after the birth of Jesus Christ.
This entry is located in the following unit: Archeology, Archaeology (page 1)
A.D., Anno Domini
Latin for "In the Year of Our Lord" [followed by the number of the year].
This entry is located in the following unit: Graveyard words for a greater understanding of epitaphs (page 1)
Word Entries at Word Info: “a d
anno Domini, A.D.
In the year of the Lord [Jesus Christ].

Some people translate anno Domini as "in the year of our Lord", but there is no Latin noster, "our", in the phrase. A.D. is written before the year, usually with small capital letters, with no separating comma, as: A.D. 1995; or informally, after the year, as: about 1450 A.D. Anno Domini is supposed to indicate the number of years from the birth of Chirst.

In the sixth century, Dionysius Exiguus initiated the system of expressing dates by referring events to the birth of Christ. According to his calculations, Christ was born in 754 A.U.C. (abbreviation, ab urbe condita; from [since] the founding of the city [Rome], c. 753 B.C.); however, it is generally agreed that Christ was born at least four years before the date that was set by Dionysius.

ante diem, a.d.
Before the day.
This entry is located in the following unit: Latin Proverbs, Mottoes, Phrases, and Words: Group A (page 17)