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sixtieth (adj., n.)

"next in order after the fifty-ninth; an ordinal numeral; being one of sixty equal parts into which a whole is regarded as divided;" Old English sixteogoða "sixtieth;" see sixty + -th (1).

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Definitions of sixtieth from WordNet
1
sixtieth (n.)
position 60 in a countable series of things;
sixtieth (n.)
one part in sixty equal parts;
Synonyms: one-sixtieth
2
sixtieth (adj.)
the ordinal number of sixty in counting order;
Synonyms: th
From wordnet.princeton.edu