WHETHER definition and meaning | Collins English Dictionary You use whether when you are talking about a choice or doubt between two or more alternatives To this day, it's unclear whether he shot himself or was murdered Whether it turns out to be a good idea or a bad idea, we'll find out They now have two weeks to decide whether or not to buy
whether - WordReference. com Dictionary of English whether ˈwɛðə conj (subordinating) used to introduce an indirect question or a clause after a verb expressing or implying doubt or choice in order to indicate two or more alternatives, the second or last of which is introduced by or or or whether: he doesn't know whether she's in Britain or whether she's gone to France (coordinating)
whether - Wiktionary, the free dictionary The main verb in adverbial clauses with whether is sometimes in the subjunctive mood, especially if the verb is be: I shall be glad to play any instrument, whether it be a violin or a trumpet