Definition of "whether" in English

conjunction

1. Introduces a simple indirect question (without a correlative).

   • Whether we'll be on time I'm unsure.
   • Do you know whether he's coming?

2. Indicates doubt between possibilities (usually with correlative or).

   • He chose the correct answer, but whether by luck or by skill I don't know.
   • I can't decide whether to get divorced now or wait.

3. Introduces a disjunctive adverbial clause qualifying the main clause (with correlative or).

   • He's coming, whether you like it or not.
   • I'll enjoy playing with my friends again, whether we win or lose.
   • Whether or not you're successful, you can be sure you did your best.

4. (obsolete) Introduces a direct question between alternatives (often with correlative or).

determiner

1. (obsolete) Which of two.

pronoun

1. (obsolete) Which of two.