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ninetieth: Meaning and Definition of
nine•ti•eth
Pronunciation: (nīn'tē-ith), [key] — adj.
- next after the eighty-ninth; being the ordinal number for 90.
- being one of 90 equal parts.
—n. - a ninetieth part, esp. of one ().
- the ninetieth member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.