DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   sincerely
       adv 1: with sincerity; without pretense; "she praised him
              sincerely for his victory"; "was unfeignedly glad to see
              his old teacher"; "we are truly sorry for the
              inconvenience" [syn: sincerely, unfeignedly, truly]
              [ant: insincerely]
       2: written formula for ending a letter [syn: sincerely,
          sincerely yours]