Etymology
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seventieth (adj., n.)

"next in order after the sixty-ninth; an ordinal numeral; being one of seventy equal parts into which a whole is regarded as divided;" late 13c., from seventy + -th (1).

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Definitions of seventieth
1
seventieth (n.)
position 70 in a countable series of things;
2
seventieth (adj.)
the ordinal number of seventy in counting order;
Synonyms: th
From wordnet.princeton.edu