Meaning & use
assumption
Something accepted as true without proof, often used as a basis for reasoning or planning.
See it in a sentence
The whole business plan rested on the assumption that prices would keep falling.
We made a wrong assumption about the meeting time and arrived an hour early.
A note on using this word
An assumption is taken as true without checking; a hypothesis, by contrast, is a claim that still needs to be tested.
Words with a similar meaning
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Words with an opposite meaning
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