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English definition of “whether”

whether

conjunction  /ˈhweð·ər, ˈweð-/ us  
(used to refer to one or more possibilities or to express uncertainty) if: I didn’t know whether he was too busy or (whether) he just didn’t want to see me. I wasn’t sure whether (or not) you’d like it.
(Definition of whether from the Cambridge Academic Content Dictionary © Cambridge University Press)
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