Fifth Avenue
         n 1: an avenue in Manhattan that separates the east side of
               Manhattan from the west side

English Dictionary: fifty-five	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
fifth part n one part in five equal parts [syn: one-fifth, fifth, fifth part, twenty percent]
From WordNet (r) 3.0 (2006) [wn]:
fifty percent n a half expressed as a percentage
From WordNet (r) 3.0 (2006) [wn]:
fifty-fifth adj the ordinal number of fifty-five in counting order [syn: fifty-fifth, 55th]
From WordNet (r) 3.0 (2006) [wn]:
fifty-fifty adj equal in degree or extent or amount; or equally matched or balanced; "even amounts of butter and sugar"; "on even terms"; "it was a fifty-fifty (or even) split"; "had a fifty-fifty (or even) chance"; "an even fight" Synonym(s): even, fifty-fifty
From WordNet (r) 3.0 (2006) [wn]:
fifty-five adj being five more than fifty [syn: fifty-five, 55, lv]
From WordNet (r) 3.0 (2006) [wn]:
fifty-four adj being four more than fifty [syn: fifty-four, 54, liv]