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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.

But it cautioned that this assumption "may need to be revised if the duration of the conflict extends and the degree of damage suffered gets reassessed".

From BBC • Apr. 14, 2026

"We make an important assumption in the paper," Hogan said.

From Science Daily • Apr. 14, 2026

The IEA’s estimates are based on an assumption that regular deliveries of oil and gas from the Middle East, although not pre-war levels, resume to international markets by the middle of the year.

From MarketWatch • Apr. 14, 2026

“A key assumption for Novo’s guidance was expected limited sequential volume growth in Wegovy pen, which through 1Q has seen a strong pick up.”

From The Wall Street Journal • Apr. 10, 2026

I'm not the sort of person normally mistaken for being fast and well-coordinated, and because of this, I found Martin's assumption to be oddly flattering.

From "Me Talk Pretty One Day" by David Sedaris

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

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

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!