whether Definition in the Cambridge English Dictionary
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Definition of “whether” - English Dictionary

Definition of "whether" - American English Dictionary

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whetherconjunction

 us   /ˈhweð·ər, ˈweð-/
(used to refer to one or more ​possibilities or to ​expressuncertainty) 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)

Definition of "whether" - British English Dictionary

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whetherconjunction

uk   /ˈweð.ər/  us   //
B1 (used ​especially in ​reportingquestions and ​expressingdoubts) if, or not: I wasn't ​sure whether you'd like it. She ​asked me whether I was ​interested in ​working for her. I'm ​wondering whether to have the ​fish or the ​beef. I ​doubt whether it'll ​work. I was ​merelyquestioning whether we have the ​money to ​fund such a ​project. It all ​depends on whether or not she has the ​time. Anyway, it's a good ​story, whether or not it's ​true.whether...or B1 (used to ​introduce two or more ​possibilities) it is not ​important if: I'm going, whether she ​likes it or not. Someone has to ​tell her, whether it's you or me. Let's ​face it - you're going to be late whether you go by ​bus or ​train.
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(Definition of whether from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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