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Definitions

assumption

[uh-suhmp-shuhn] / əˈsʌmp ʃən /
NOUN
taking something for granted; something expected
Synonyms
STRONGEST
acceptance belief expectation guess hunch hypothesis inference premise presumption supposition suspicion theory
STRONG
conjecture fancy posit postulate postulation presupposition shot stab supposal surmise theorization
WEAK
accepting assuming shot in the dark sneaking suspicion
Antonyms
STRONGEST
disbelief fact knowledge measurement proof reality truth
WEAK
doubt genuineness naturalness realness unexpected
NOUN
assuming possession, power
Synonyms
STRONGEST
acceptance
STRONG
acquisition adoption appropriation arrogation embracing grab seizure takeover taking undertaking usurpation
WEAK
accepting assuming shouldering taking on taking up
Antonyms
STRONG
rejection
WEAK
doubt genuineness naturalness reality realness unexpected
NOUN
arrogance
Synonyms
STRONGEST
presumption
STRONG
brass chutzpah cockiness conceit imperiousness insolence nerve pride sass self-importance
Antonyms
STRONG
humility modesty shyness timidity
WEAK
doubt genuineness naturalness reality realness unexpected

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The recent sharp fall in oil prices after the announcement of the ceasefire was built on the assumption of the return to some sort of normality within days or weeks.

From BBC • Apr. 30, 2026

The basis for that optimism is that the CBO projections are based on the assumption that Social Security trust funds will be fully funded and thus able to pay full benefits scheduled under current law.

From MarketWatch • Apr. 28, 2026

Then the team assessed how strongly the evidence supported or refuted each assumption.

From Slate • Apr. 28, 2026

It’s also 10% below Macquarie’s long-term price assumption of US$1,350/ton.

From The Wall Street Journal • Apr. 27, 2026

I am under the assumption that I am a more advanced model, but I do not want to engage in what the hazmats call bragging.

From "A Rover's Story" by Jasmine Warga

Vocabulary lists containing assumption

Academic Vocabulary Toolkit 1, Words 1-10

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

Jim Burke's Academic Vocabulary List

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The SAT: Language of the Test, List 5

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!