60th
         adj 1: the ordinal number of sixty in counting order [syn:
                  {sixtieth}, {60th}]

English Dictionary: 64th	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
64th adj the ordinal number of sixty-four in counting order [syn: sixty-fourth, 64th]
From WordNet (r) 3.0 (2006) [wn]:
65th adj the ordinal number of sixty-five in counting order [syn: sixty-fifth, 65th]
From WordNet (r) 3.0 (2006) [wn]:
6th adj coming next after the fifth and just before the seventh in position Synonym(s): sixth, 6th