whether or not

Idioms  

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]

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Example Sentences

The problem would also extend to people who may not know who their own parents are, and thus would be unable to establish whether or not their parents were citizens and, in turn, unable to prove whether or not they are citizens.

From Salon

Wall Street is waiting to see whether or not new CEO Josh D’Amaro can lead the company into a new era.

From Barron's

‘Regardless of whether or not the move is legal, it is certainly disgraceful, despicable, reprehensible, loathsome, outrageous and just plain truly pathetic,’ writes an L.A.

From Los Angeles Times

“If you write down what you’re thinking, it makes you more aware of what you’re thinking, which allows you to assess whether or not your thoughts are true, which is important if you’re having negative thoughts.”

From Literature

I look at him, try to judge whether or not he’s serious.

From Literature