Longman Dictionary of Contemporary English homepage

supposition

 noun
     
sup‧po‧si‧tion [uncountable and countable]
something that you think is true, even though you are not certain and cannot prove it:
His version of events is pure supposition.
supposition (that)
The police are acting on the supposition that she took the money.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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