eighty-first

[ey-tee-furst]
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adjective

next after the eightieth; being the ordinal number for 81.
being one of 81 equal parts.

noun

an eighty-first part, especially of one (1/81).
the eighty-first member of a series.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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