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active duty.
art director.
assembly district.
assistant director.
athletic director.
average deviation.
in the year of the Lord; since Christ was born:
Charlemagne was born in a.d. 742.
before the day.
after date.
autograph document.
Contemporary Examples

A.D.: New Orleans After the Delugeby Josh Neufeld A graphic novel depicts the nightmare of Hurricane Katrina.
The Daily Beast Recommends The Daily Beast August 24, 2009

But when John II was born, in A.D. 470, his parents named his Mercurius.
Can We Call Him Frank? New Pope Picks New Name, Francis Andrew Romano March 12, 2013

American Splendor artist Josh Neufeld tackles a weighty subject in his graphic novel A.D.: New Orleans After the Deluge.
The Daily Beast Recommends The Daily Beast August 24, 2009

The original Russian state, “Old Russia,” was established at Novgorod in A.D. 862 by marauding Vikings.
Russian History Is on Our Side: Putin Will Surely Screw Himself P. J. O’Rourke May 10, 2014

Since Paul was executed in Rome about 65 A.D., this is the earliest testimony we have regarding the alleged resurrection.
10 Reasons the Resurrection Really Happened Jeffrey Hart April 9, 2009

Historical Examples

In 536 A.D. the sun is said to have been darkened for a year and two months!
Astronomical Curiosities J. Ellard Gore

What will the modern chasubles and copes around us, now so fresh and splendid, look like in A.D. 2500?
Catholic World, Vol. XI, April 1870-September 1870 Various

We are now only in A.D. 1915—surely we could afford to chuck away a century or two?
The Journal of a Disappointed Man Wilhelm Nero Pilate Barbellion

What could be more humiliating than the circumstances under which it took place (A.D. 846)?
History of the Conflict Between Religion and Science John William Draper

It deteriorated morally after A.D. 380–90, the date of the triumph of Christianity!
The Churches and Modern Thought Philip Vivian

1570s, from Latin Anno Domini “Year of the Lord.” First put forth by Dionysius Exiguus in 527 or 533 C.E., but at first used only for Church business. Introduced in Italy in 7c., France (partially) in 8c. In England, first found in a charter of 680 C.E. Ordained for all ecclesiastical documents in England by the Council of Chelsea, July 27, 816.

The resistance to it in part might have come because Dionysius chose 754 A.U.C. as the birth year of Jesus, while many early Christians would have thought it was 750 A.U.C. [See John J. Bond, “Handy-Book of Rules and Tables for Verifying Dates With the Christian Era,” 4th ed., London: George Bell & Sons, 1889] A.C., for Anno Christi, also was common 17c.

An abbreviation used with a date, indicating how many years have passed since the birth of Jesus. The abbreviation may appear before the date (a.d. 1988), or it may appear after the date (1988 a.d.). It stands for anno Domini, a Latin phrase meaning “in the year of our Lord.” (Compare b.c.)
after date
Latin ante diem (before the day)
autograph document
Latin anno Domini (in the year of our Lord)
Latin auris dexter (right ear)