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Definition of “whether” - English Dictionary

"whether" in American English

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whetherconjunction

 us   /ˈhweð·ər, ˈweð-/
(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)







"whether" in British English

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whetherconjunction

uk   /ˈweð.ər/  us   /ˈweð.ɚ/
B1 (used especially in reporting questions and expressing doubts) 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 merely questioning 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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