whether or not

1. 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]

Example Sentences

Newsom said he “requested an independent review” of the data release in order to “make a judgment as to whether or not it was appropriate, whether or not it was consistent with past practices or whether or not it should be adjusted in terms of policy.”

From Los Angeles Times

USC is “test optional” in its application process and students can decide whether or not to submit scores.

From Los Angeles Times

The High Court ruled Medpro failed to prove whether or not its surgical gowns, which were to be used by NHS workers, had undergone a validated sterilisation process.

From BBC

Whether or not these foreign professionals will "find that space for creativity innovation" in China remains a key question for those considering the move.

From BBC

The High Court ruled the Medpro failed to prove whether or not its surgical gowns, which were to be used by NHS workers, had undergone a validated sterilisation process.

From BBC