assumption

Pronunciation

• IPA ^(key): /əˈsʌmp.ʃən/

• Audio (US)

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Noun

Singular assumption

Plural assumptions

1. (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.

Related words

• assume
• assumptive