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Postulate

/pˈɑstʃəˌleɪt/
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(noun) Something assumed without proof as being self-evident or generally accepted, especially when used as a basis for an argument. Sometimes distinguished from axioms as being relevant to a particular science or context, rather than universally true, and following from other axioms rather than being an absolute assumption.

We need to postulate a completely different paradigm to explain all these phenomena.
CEFR Practice Quiz
The mathematician chose to ____ the existence of a fifth axiom to complete the proof.

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