DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   tad
       n 1: a slight amount or degree of difference; "a tad too
            expensive"; "not a tad of difference"; "the new model is a
            shade better than the old one" [syn: tad, shade]