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English definition of “if”

if

noun [C usually singular]     /ɪf/ informal
something that is not certain or not yet decided : There's a big if hanging over the project still (= it is uncertain whether the project will happen ).Suspecting and questioningQuestioning people and asking questions in generalCuriosity
(Definition of if noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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