Adverbial ad has 1 sense
  1. AD, A.D., anno Domini - in the Christian era; used before dates after the supposed year Christ was born; "in AD 200"
,Noun ad has 1 sense
  1. ad, advertisement, advertizement, advertising, advertizing, advert - a public promotion of some product or service
    --1 is a kind of promotion, publicity, promotional material, packaging
    --1 has particulars:
     direct mail; preview, prevue, trailer; advertorial; mailer; newspaper ad, newspaper advertisement; commercial, commercial message; circular, handbill, bill, broadside, broadsheet, flier, flyer, throwaway; teaser; top billing
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