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English definition of “fourth”

fourth

ordinal number uk   /fɔːθ/ us    /fɔːrθ/
A2 4th written as a word: My birthday is on the fourth (of December). Daniel was/came fourth in the race.Ordinal numbers

fourth

noun [C]
mainly US a quarter noun: Three fourths of his students, or 75 percent, come from the local area.Fractions
(Definition of fourth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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