assumption
noun
as·sump·tion ə-ˈsəm(p)-shən 
1
: a taking to or upon oneself
the assumption of a new position
2
: the act of laying claim to or taking possession of something
the assumption of power
3
a
: an assuming that something is true
a mistaken assumption
b
: a fact or statement (such as a proposition, axiom (see axiom sense 2), postulate, or notion) taken for granted
4
a
: the taking up of a person into heaven
b
capitalized : August 15 observed in commemoration of the Assumption of the Virgin Mary
5
: the taking over of another's debts
6
: arrogance, pretension
Synonyms
- given
- hypothetical
- if
- postulate
- premise
- premiss
- presumption
- presupposition
- supposition
See all Synonyms & Antonyms 
Example Sentences
I made the assumption that he was coming, so I was surprised when he didn't show up. He will come home tomorrow. At least, that's my assumption. Many scientific assumptions about Mars were wrong. I'm telling you our arrival time on the assumption that you will check to see whether or not our flight is on time before you come to the airport. Her plan is based on the underlying assumption that the economy will improve in the near future. her assumption of the presidency the buyer's assumption of debt See More
Recent Examples on the Web The assumption after two regular-season losses in 2021 was that the defense was the issue and Knowles was the answer. 
Doug Lesmerises, cleveland, 3 Sep. 2022 Mortgage assumption, as the practice is known, is garnering attention for the first time in years. Ben Eisen, WSJ, 28 Aug. 2022 Companies must challenge the decades-old assumption that business application data can only arrive into analytics platforms on a nightly basis. Adrian Bridgwater, Forbes, 26 Aug. 2022 The sailors would pay dearly for this faulty assumption. Matthew F. Delmont, Smithsonian Magazine, 25 Aug. 2022 Such an assumption is apparently based on the operation of Quint Digital Media, in which Adani acquired a stake in March this year. Niharika Sharma, Quartz, 25 Aug. 2022 Wall Street has found relief in a better-than-expected batch of corporate earnings and the slight slowdown in US inflation, bolstering the assumption that the Fed won't need to keep hiking interest rates as aggressively. Julia Horowitz, CNN, 22 Aug. 2022 Over recent years, that assumption has come under fire. Ned Temko, The Christian Science Monitor, 18 Aug. 2022 The Bond series is considered the prize of MGM’s extensive library, and there’s an assumption that Warners would have a chance to release James Bond 27. Pamela Mcclintock, The Hollywood Reporter, 14 Aug. 2022 See More
Doug Lesmerises, cleveland, 3 Sep. 2022 Mortgage assumption, as the practice is known, is garnering attention for the first time in years. Ben Eisen, WSJ, 28 Aug. 2022 Companies must challenge the decades-old assumption that business application data can only arrive into analytics platforms on a nightly basis. Adrian Bridgwater, Forbes, 26 Aug. 2022 The sailors would pay dearly for this faulty assumption. Matthew F. Delmont, Smithsonian Magazine, 25 Aug. 2022 Such an assumption is apparently based on the operation of Quint Digital Media, in which Adani acquired a stake in March this year. Niharika Sharma, Quartz, 25 Aug. 2022 Wall Street has found relief in a better-than-expected batch of corporate earnings and the slight slowdown in US inflation, bolstering the assumption that the Fed won't need to keep hiking interest rates as aggressively. Julia Horowitz, CNN, 22 Aug. 2022 Over recent years, that assumption has come under fire. Ned Temko, The Christian Science Monitor, 18 Aug. 2022 The Bond series is considered the prize of MGM’s extensive library, and there’s an assumption that Warners would have a chance to release James Bond 27. Pamela Mcclintock, The Hollywood Reporter, 14 Aug. 2022 See More Word History
Etymology
Middle English, from Late Latin assumption-, assumptio taking up, from Latin assumere — see assume
First Known Use
13th century, in the meaning defined at sense 4a
Phrases Containing assumption
Kids Definition
assumption
noun
as·sump·tion ə-ˈsəmp-shən
1
: the act of taking on
the assumption of power
2
: something accepted as true
I'm making plans on the assumption that you will be here.
assumption
noun
1
as in premise
something taken as being true or factual and used as a starting point for a course of action or reasoning the widespread assumption that violent entertainment leads to violent behavior in children your argument is faulty because it's based on erroneous assumptions Synonyms & Similar Words
Relevance
- premise
- theory
- hypothesis
- belief
- presumption
- presupposition
- hypothetical
- supposition
- postulate
- if
- given
- assertion
- premiss
- principle
- axiom
- proposition
- inference
- conclusion
- basis
- thesis
- truism
- doctrine
- rule
- tenet
- dogma
- law
- precept
- declaration
- foundation
- gospel
- standard
- verity
- affirmation
- deduction
- canon
- dictum
- ground
- avouchment
- ipse dixit
2
as in arrogance
an exaggerated sense of one's importance that shows itself in the making of excessive or unjustified claims his air of assumption tended to put people off rather quickly Synonyms & Similar Words
- arrogance
- superiority
- attitude
- consequence
- disdain
- pretense
- pretension
- pretence
- bumptiousness
- presumptuousness
- superciliousness
- haughtiness
- imperiousness
- peremptoriness
- loftiness
- high horse
- pomposity
- hauteur
- self-consequence
- pretentiousness
- pompousness
- pridefulness
- dominance
- huffiness
- toploftiness
- lordliness
- masterfulness
- vanity
- inflation
- self-importance
- condescension
- pride
- snobbery
- snobbishness
- scorn
- bossiness
- snobbism
- bravado
- authoritativeness
- smugness
- brag
- side
- snootiness
- triumphalism
- conceit
- self-assumption
- egoism
- boastfulness
- sauciness
- cheekiness
- cockiness
- high-handedness
- impudence
- swagger
- complacence
- braggadocio
- egotism
- bowwow
- vaingloriousness
- impertinence
- strut
- vainglory
- self-assertion
- chest-thumping
- swelled head
- self-opinion
- superiority complex
- bombast
- cheek
- self-conceit
- self-content
- self-complacency
- self-contentment
- self-satisfaction
- self-centeredness
- self-partiality
Antonyms & Near Antonyms
- humility
- modesty
- unpretentiousness
- unassumingness
- shyness
- timidity
- diffidence
- bashfulness
- passivity
- demureness
- timidness
- reserve
- submissiveness
- passiveness
- meekness
- retiringness
- reservedness
- lowliness
- self-doubt
- quietness
- mousiness
- self-distrust