IPA: /əˈsuːmɪŋ/
KK: /əˈsumɪŋ/
Having an attitude of superiority or self-importance, often without justification.
His assuming nature made it difficult for others to work with him.
Comparative: more assuming
Superlative: most assuming
Used to indicate that something is true or will happen based on a certain condition or premise.
Assuming it doesn't rain, we will have a picnic tomorrow.
Assuming is formed from "assumere" (meaning to take up or receive) and the suffix "-ing" (indicating the action or process of). The word describes the action of taking something for granted or accepting something as true without proof.
Think of 'taking up' ('assumere') an idea or belief without questioning it — that's what assuming means.