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eighty-ninth

[ ey-tee-nahynth ]
/ ˈeɪ tiˈnaɪnθ /
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adjective
next after the eighty-eighth; being the ordinal number for 89.
being one of 89 equal parts.
noun
an eighty-ninth part, especially of one (1/89).
the eighty-ninth member of a series.
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Which of the following nouns has an irregular plural form?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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