noun

assumption

uh-SUHM-shn

noun

Something accepted as true without proof, or the act of accepting it as true.

"The whole plan rested on a false assumption."

"Let's work on the assumption that the budget stays the same."

The act of taking on a role, duty, or responsibility.

"His assumption of the presidency marked a turning point for the party."

How to Use Assumption

Learner’s notes

In plain EnglishSomething taken to be true without being checked, or the act of taking on a role.

Common pairings

false assumption underlying assumption make an assumption

assumptions plural

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The whole plan rested on a false _____.

From Latin assumptio ("a taking up"), from assumere (see "assume"), plus the noun suffix "-ion".

ion lion Zion Dion Sion union scion Orion Onion action minion bunion