Part of AD (4)
I believe the answer is:
anno
(Other definitions for anno that I've seen before include "...Domini, AD" , "...Domini, year of Our Lord" , "Year (L.)" , "... Domini, after the birth of Christ" .)
I believe the answer is:
anno
(Other definitions for anno that I've seen before include "...Domini, AD" , "...Domini, year of Our Lord" , "Year (L.)" , "... Domini, after the birth of Christ" .)