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ad (n.)

abbreviation of advertisement, attested by 1841. Long resisted by those in the trade, and according to Mencken (1945) denounced by William C. D'Arcy (president of Associated Advertising Clubs of the World) as "the language of bootblacks, ... beneath the dignity of men of the advertising profession."

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Definitions of ad from WordNet
1
ad (n.)
a public promotion of some product or service;
Synonyms: advertisement / advertizement / advertising / advertizing / advert
2
ad (adv.)
in the Christian era; used before dates after the supposed year Christ was born;
Synonyms: A.D. / anno Domini
From wordnet.princeton.edu