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
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
Recent Examples on the Web
This method forces teams to rethink their assumptions and explore unconventional angles.
—
Expert Panel®, Forbes.com, 28 Apr. 2025
The three-time Pro Bowler’s placement on this list is operating under the assumption that Andrews is content remaining with the Ravens and hasn’t become disenchanted with all of the trade speculation and criticism he’s gotten for how Baltimore’s 2024 season ended.
—Jeff Zrebiec, New York Times, 28 Apr. 2025
The show’s Season 3 renewal confirms the assumption that Season 2 only adapts part of the narrative from The Last of Us: Part II video game.
—Lissete Lanuza Sáenz, StyleCaster, 27 Apr. 2025
That assumption, experts said, carries new risks for the city and its police department.
—Jakob Rodgers, Mercury News, 25 Apr. 2025
See All Example Sentences for assumption
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Expert Panel®, Forbes.com, 28 Apr. 2025
The three-time Pro Bowler’s placement on this list is operating under the assumption that Andrews is content remaining with the Ravens and hasn’t become disenchanted with all of the trade speculation and criticism he’s gotten for how Baltimore’s 2024 season ended.
—Jeff Zrebiec, New York Times, 28 Apr. 2025
The show’s Season 3 renewal confirms the assumption that Season 2 only adapts part of the narrative from The Last of Us: Part II video game.
—Lissete Lanuza Sáenz, StyleCaster, 27 Apr. 2025
That assumption, experts said, carries new risks for the city and its police department.
—Jakob Rodgers, Mercury News, 25 Apr. 2025
See All Example Sentences for assumption
Cite this Entry
“Assumption.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assumption. Accessed 1 May. 2025.
Copy CitationKids Definition
assumption
noun
as·sump·tion
ə-ˈsəm(p)-shən
1
capitalized
: August 15 observed as a church festival to mark the taking up of the Virgin Mary into heaven
2
a
: the act of taking upon oneself or taking possession of something
3
a
: the belief that something is true
b
: a fact or statement taken for granted
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