postulate
US /ˈpɑːs.tʃə.leɪt/
UK /ˈpɑːs.tʃə.leɪt/
1.
suggest or assume the existence, fact, or truth of (something) as a basis for reasoning, discussion, or belief.
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He postulated that the universe is expanding.
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The theory postulates a new type of particle.
1.
a fundamental truth or proposition that serves as the foundation for a system of belief or a chain of reasoning.
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Euclid's fifth postulate is famous in geometry.
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The entire argument rests on this basic postulate.