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Supposition

/sˌʌpəˈzɪʃən/
C1
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(noun) Something that is supposed; an assumption made to account for known facts, conjecture.

It is founded on supposition.
This supposition, that the Earth is immobile, was completely untrue.
CEFR Practice Quiz
The lawyer argued that the prosecution's case was based on mere ____ rather than on any solid evidence today.

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