Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “supposition”

supposition

noun [C]  /ˌsʌp·əˈzɪʃ·ən/ fml us  
an idea that something may be true, although it is not certain: [+ that clause] The investment was based on the supposition that there was adequate demand for a new modern office building.
(Definition of supposition from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of supposition?
Browse related topics

You are looking at an entry to do with Guesses and assumptions, but you might be interested in these topics from the Thinking, dreaming and ideas topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “supposition” in other dictionaries

Word of the Day

aptitude

a natural ability or skill

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More