as·​sump·​tion | \ ə-ˈsəm(p)-shən How to pronounce assumption (audio) \

Definition of assumption

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
3a : 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
4a : 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

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Examples of assumption in a Sentence

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 This assumption is misleading and affects the discussion about AI ethics considerably. Lance Eliot, Forbes, 2 May 2022 The assumption was that the street grid would go through the site and cut it up into lots of little programmed bits. Alexandra Lange, The New Yorker, 29 Apr. 2022 But when it was crafted, the assumption was that unaffiliated voters — 29% of all voters statewide — would be able to sign petitions for any party. Robert Gehrke, The Salt Lake Tribune, 27 Apr. 2022 The assumption is that growers/makers are being paid more by companies as supply chains are shrunk. Esha Chhabra, Forbes, 26 Apr. 2022 The assumption, of course, is that the delay is measured in weeks or a small number of months. Washington Post, 20 Apr. 2022 In some parts of the country, masks have become rare sights, and the assumption is the pandemic is over. NBC News, 17 Apr. 2022 Initially, the assumption was that the notebooks had been misplaced. Jennifer Ouellette, Ars Technica, 5 Apr. 2022 The assumption was that the Holiday Bowl would be quarterback Dorian Thompson-Robinson’s last college game, and there was certainly a chance that star running back Zach Charbonnet would be joining him in the NFL draft. Los Angeles Times, 31 Mar. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'assumption.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of assumption

13th century, in the meaning defined at sense 4a

History and Etymology for assumption

Middle English, from Late Latin assumption-, assumptio taking up, from Latin assumere — see assume

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Time Traveler for assumption

Time Traveler

The first known use of assumption was in the 13th century

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Last Updated

12 May 2022

Cite this Entry

“Assumption.” Dictionary, Merriam-Webster, Accessed 21 May. 2022.

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More Definitions for assumption


as·​sump·​tion | \ ə-ˈsəmp-shən How to pronounce assumption (audio) \

Kids Definition of assumption

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.

More from Merriam-Webster on assumption

Nglish: Translation of assumption for Spanish Speakers

Britannica English: Translation of assumption for Arabic Speakers Encyclopedia article about assumption


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