whether --- or
1. {coord. conj.}
Used to introduce an indirect question.
You must decide whether you should go or stay.
I don't know whether Jack or Bill is a better player.
Compare: EITHER --- OR
2. Used to show a choice of things, or that different things are possible.
Whether the bicycle was blue or red, it didn't matter to Frank.
Categories:
Source: A Dictionary of American Idioms