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seventieth

[sev-uh n-tee-ith] /ˈsɛv ən ti ɪθ/
adjective
1.
next after the sixty-ninth; being the ordinal number for 70.
2.
being one of 70 equal parts.
noun
3.
a seventieth part, especially of one (1/70).
4.
the seventieth member of a series.
Origin of seventieth
1250-1300
First recorded in 1250-1300, seventieth is from the Middle English word seventithe. See seventy, -eth2
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for seventieth

seventieth

/ˈsɛvəntɪɪθ/
adjective
1.
(usually prenominal)
  1. being the ordinal number of seventy in numbering or counting order, position, time, etc: often written 70th
  2. (as noun): the seventieth in line
noun
2.
  1. one of 70 approximately equal parts of something
  2. (as modifier): a seventieth part
3.
the fraction equal to one divided by 70 (1/70)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for seventieth
adj.

late 13c., from seventy + -th (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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16
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