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assumption (noun) supposition; something that is supposed.
Believing or having a feeling that something is true, usually without proof, is assumption. 'Your assumption that war can restore peace is not correct,' means your supposing that war can bring about peace is not correct. An assumption, in other words, is a guess, and needs proof to make it correct. The quantity of food we make ready for dinner is decided by our assumption of the number of guests we expect. Revolutionaries, that is, people who cause a society to think and act entirely a new and better way, often begin by challenging the basic assumptions of the society.
- Brigitte's assumption that many young men would fall for her good looks proved wrong, when none of her boy friends went steady with her for more than a week or two.
- Galileo was persecuted lifelong by the church for challenging the then centuries-old assumption that the Earth was the center of the Solar System.