assumption
Pronunciation change
Noun change
- (countable) An assumption is a guess or belief about something without having enough information to know if it is true. In maths or science: something assumed to be true in order to build an argument or calculation.
- Synonym: presumption
- You shouldn't make the assumption that guns are only a problem in big cities.
- To calculate the age of a rock we make the assumption that the rate of radioactive decay is constant.