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
Synonyms
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
The real magic happens when people bring ideas to life — when teams push boundaries, challenge assumptions and pour their passion into building something extraordinary.
—
Calvin Rasode, Rolling Stone, 3 Feb. 2025
In addition, any opinions and assumptions expressed herein are made as of the date of this communication and are subject to change and/or withdrawal without notice.
—Katie Stockton, CNBC, 3 Feb. 2025
Those assumptions were reflected in everything from Nvidia's stock price to energy investments and data center plans.
—Ars Technica, 30 Jan. 2025
Given his job is to keep the president alive, the safe assumption would be that Xavier was hurt in the line of duty.
—Ben Travers, IndieWire, 28 Jan. 2025
See all Example Sentences for assumption 
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Calvin Rasode, Rolling Stone, 3 Feb. 2025
In addition, any opinions and assumptions expressed herein are made as of the date of this communication and are subject to change and/or withdrawal without notice.
—Katie Stockton, CNBC, 3 Feb. 2025
Those assumptions were reflected in everything from Nvidia's stock price to energy investments and data center plans.
—Ars Technica, 30 Jan. 2025
Given his job is to keep the president alive, the safe assumption would be that Xavier was hurt in the line of duty.
—Ben Travers, IndieWire, 28 Jan. 2025
See all Example Sentences for assumption
Dictionary Entries Near assumption
Cite this Entry
“Assumption.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assumption. Accessed 8 Feb. 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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