The "A" in A.D (4)

I believe the answer is:

anno

(Other definitions for anno that I've seen before include "... Domini, after the birth of Christ" , "...Domini, AD" , "Year (L.)" , "...Domini, year of Our Lord" .)

I've seen this clue in the Universal, the USA Today, the Penny Press, The New York Times and the L.A. Times Daily.

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