Word Study
ad
OXFORD DICTIONARY
ad, abbr. (of a date) of the Christian era.
Usage
Strictly, AD should precede a date (e.g. AD 410), but uses such as the tenth century AD are well established.
Etymology
Anno Domini, 'in the year of the Lord'
ad, n. colloq. an advertisement.
Etymology
abbr.
ROGET THESAURUS
ad
Publication
N publication, public announcement, promulgation, propagation, proclamation, pronunziamento, circulation, indiction, edition, hue and cry, publicity, notoriety, currency, flagrancy, cry, bruit, hype, vox populi, report, the Press, public press, newspaper, journal, gazette, daily, telegraphy, publisher, imprint, circular, circular letter, manifesto, advertisement, ad, placard, bill, affiche, broadside, poster, notice, published, current, in circulation, public, notorious, flagrant, arrant, open, trumpet-tongued, encyclical, encyclic, promulgatory, exoteric, publicly, in open court, with open doors, Int, Oyez!, O yes!, notice!, notice is hereby given, this is to give, these are to give notice, nomina stultorum parietibus haerent, semel emissum volat irrevocabile verbum.For further exploring for "ad" in Webster Dictionary Online