AD
Pronunciation: /eɪˈdiː/
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Definition of AD
abbreviation
ad is normally written in small capitals and should be placed before the numerals, as in ad 375 (not 375 ad). The reason for this is that ad is an abbreviation of anno domini, which means ‘in the year of our Lord’. However, when the date is spelled out, it is normal to write the third century ad (not ad the third century). Compare with BC.