Russell's paradox
noun
Rus·sell's paradox
ˈrəsəlz-
: a paradox that discloses itself in forming a class of all classes that are not members of themselves and in observing that the question of whether it is true or false if this class is a member of itself can be answered both ways compare liar paradox, vicious circle principle
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Merriam-Webster unabridged
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