eightieth

[ey-tee-ith]
adjective
1.
next after the seventy-ninth; being the ordinal number for 80.
2.
being one of 80 equal parts.
noun
3.
an eightieth part, especially of one (1/80).
4.
the eightieth member of a series.

Origin:
1350–1400; Middle English eightetithe, Old English (hund)eahtatigotha eightieth. See eighty, -th2

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World English Dictionary
eightieth (ˈeɪtɪɪθ)
 
adj
1.  (usually prenominal)
 a.  being the ordinal number of eighty in numbering or counting order, position, time, etc: often written 80th
 b.  (as noun): the eightieth in succession
 
n
2.  a.  one of 80 approximately equal parts of something
 b.  (as modifier): an eightieth part
3.  the fraction equal to one divided by 80 (1/80)

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Example sentences
However, as she approaches her eightieth birthday next year, she has been having an easier time of it.
He was only a few weeks away from his eightieth birthday.
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