Meaning & use
supposition
An idea or theory that is believed to be true without definite proof.
See it in a sentence
The detective's theory was only a supposition until new evidence confirmed it.
Scientists tested the supposition that warmer oceans were driving the fish northward.
A note on using this word
Supposition suggests a tentative guess rather than a rigorously tested claim, so it often pairs with mere or bare.
Words with a similar meaning
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