70th
         adj 1: the ordinal number of seventy in counting order [syn:
                  {seventieth}, {70th}]

English Dictionary: 7th	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
75th adj the ordinal number of seventy-five in counting order Synonym(s): seventy-fifth, 75th
From WordNet (r) 3.0 (2006) [wn]:
7th adj coming next after the sixth and just before the eighth in position Synonym(s): seventh, 7th