I found the following sentence on one of Youtube videos that I've watched. In actual fact, I cannot understand the what is the meaning of "not least" in the sentence. Though, I tried to think about the context and guess the meaning of it, I couldn't find it. Therefore, could someone please let me know what is the meaning of that phrase.
It would prove to be a fiendishly difficult problem to solve. Not least because brilliant Maxwell had come up with an idea far far ahead of its time.
Referenced video (with time) :-
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Please see https://www.onelook.com/?w=not+least&ls=a
This website is good for finding definitions across dictionaries.