1
general::
Phrase(s): whether or not
either if something is the case or if something is not the case; one way or the other. • I’ll drive to New York tomorrow whether or not it rains. • I’m going to the mall whether you come with me or not.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, whether or no. Regardless of whether, no matter if. For example, Whether or not it rains, we're going to walk to the theater, or She plans to sing at the wedding, whether or no anyone asks her to. The negative element in these constructions may Also follow the subject and verb, as in I have to attend, whether I want to or not. [c. 1600]
American Heritage Idioms