Meanings
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1
adj
the ordinal number of eighty in counting order
The eightieth name was difficult to read.
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2
noun
position 80 in a countable series of things
The eightieth name was difficult to read.
Etymology
From earlier eighteth, from Middle English eightetithe, eiȝtetithe, eiȝtithe; equivalent to eighty + -eth. For the modern form, see the etymological notes at twentieth.