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Define the word Ad-

Ad- \Ad-\ [A Latin preposition, signifying to. See At.]
   As a prefix ad- assumes the forms ac-, af-, ag-, al-, an-,
   ap-, ar-, as-, at-, assimilating the d with the first letter
   of the word to which ad- is prefixed. It remains unchanged
   before vowels, and before d, h, j, m, v. Examples: adduce,
   adhere, adjacent, admit, advent, accord, affect, aggregate,
   allude, annex, appear, etc. It becomes ac- before qu, as in
   acquiesce.
   [1913 Webster]

ad
     n : a public promotion of some product or service [syn: advertisement,
          advertizement, advertising, advertizing, advert]
     adv : in the Christian era; used before dates after the supposed
           year Christ was born; "in AD 200" [syn: A.D., anno Domini]

A.D.
     adv : in the Christian era; used before dates after the supposed
           year Christ was born; "in AD 200" [syn: AD, anno Domini]

AD
     Active Directory (MS, WIndows, AD, DS)
     
     

AD
     Analog-to-Digital (D/A), "A/D"
     
     

AD
     Authorized Distributor (DEC)
     
     

AD
     Autonomous DOMAIN
     
     

AD
     
        Administrative Domain
     
     

ad
     
         The country code for Andorra.
     
        (1999-01-26)