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English definition of “ninetieth”

ninetieth

ordinal number uk   /ˈnaɪn.ti.əθ/ us    /-t̬i-/
90th written as a word

ninetieth

noun [C] uk   /ˈnaɪn.ti.əθ/ us    /-t̬i-/
one of 90 equal parts of something
(Definition of ninetieth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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