Wrong: He died in 1865 A.D.
Right: He died A.D. 1865.
Wrong: We live in the 20th century A.D.
Right: We live in the 20th century of the Christian Era.
From the American College Encyclopedic Dictionary, vol. II (1952)
In some countries' postal systems, a delivery report can be requested.
This is commonly referred to as "Acknowledgement Due" request, and letters sent thus are captioned with an "A.D" or a "Registered A.D."
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