Meaning of “whether” - Learner’s Dictionary

whether

conjunction us uk /ˈweðər/
Extra Examples
She's still in a dilemma about whether she should go or not.Parliament will vote today on whether or not to pass the reform bill.I'm still undecided about whether or not to apply for the job.I'm still debating whether to go out tonight or not.I haven't decided whether or not to tell him.
CHOICE

B1 used to talk about a choice between two or more possibilities:

Someone's got to tell her, whether it's you or me.
I didn't know whether or not to go.
IF

B1 if:

I wasn't sure whether you'd like it.

(Definition of “whether” from the Cambridge Learner’s Dictionary © Cambridge University Press)