noun
assumption
uh-SUHM-shn
noun
1
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."
2
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 notesIn 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
Word Forms
assumptions plural
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The whole plan rested on a false _____.
Etymology
From Latin assumptio ("a taking up"), from assumere (see "assume"), plus the noun suffix "-ion".