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
Humans will glance at another human and make a broad assumption about the emotional state of that person by merely observing their face.
—
Lance Eliot, Forbes, 10 Jan. 2025
But the officials and victims assembled in the Situation Room considered whether this assumption was really valid.
—Shane Harris, The Atlantic, 10 Jan. 2025
This archetype is essential in a world where assumptions often go unchallenged, stifling creativity and growth.
—Chris Schembra, Rolling Stone, 10 Jan. 2025
Biden's is one of muddling through crises, reacting to unforeseen events, and being trapped by its own biases and assumptions.
—Paul Du Quenoy, Newsweek, 9 Jan. 2025
See all Example Sentences for assumption 
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Lance Eliot, Forbes, 10 Jan. 2025
But the officials and victims assembled in the Situation Room considered whether this assumption was really valid.
—Shane Harris, The Atlantic, 10 Jan. 2025
This archetype is essential in a world where assumptions often go unchallenged, stifling creativity and growth.
—Chris Schembra, Rolling Stone, 10 Jan. 2025
Biden's is one of muddling through crises, reacting to unforeseen events, and being trapped by its own biases and assumptions.
—Paul Du Quenoy, Newsweek, 9 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 19 Jan. 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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