assumption

word

/əˈsəmpʃən/
uh-SUHMP-shuhn
/ɐsˈʌmpʃən/
uh-SUHMP-shuhn

Definition

Something that you accept as true without proof, often used as the basis for reasoning or making decisions.

Usage & Nuances

Common in formal, academic, and business contexts. Often used with 'make an assumption', 'challenge an assumption', or 'underlying assumption'. Do not confuse with 'presumption', which has a similar meaning but sometimes implies arrogance.

Example Sentences

It is a common assumption that cats hate water.

basic

His plan was based on the assumption that everyone would agree.

basic

We should check if this assumption is correct.

basic

Don’t make the assumption that he’s not coming just because he’s late.

natural

That’s a risky assumption to base your argument on.

natural

People often act on assumptions rather than facts.

natural