assumes; assumed; assuming
1
: to think that something is true or probably true without knowing that it is true
I assumed he was coming, so I was surprised when he didn't show up.
"Is he coming?" "So I assume." = "I assume so."
I think we can safely assume that he's coming. = I think it's safe to assume that he's coming.
She assumed from his expression that he was confused.
Let's assume [=suppose] (that) she rejects your invitation. What will you do then? = Assuming (that) she rejects your invitation, what will you do? [=what will you do if she rejects your invitation?]
We'll be arriving around noon. That's assuming that our flight is on time.
The study assumes that the problem develops after birth. [=the study does not consider the possibility that the problem may begin before birth]
2
a
: to begin (a role, duty, etc.) as a job or responsibility
She assumed the presidency. = She assumed the position of president.
assume [=take] office
The king assumed the throne when he was very young.
b
: to take or begin to have (power, control, etc.) in a job or situation
He is ready to assume [=take] control of the organization.
3
: to begin to have (a particular appearance or quality)
The last game of the season assumes much greater importance now. [=it becomes much more important now]
Their financial problems assumed huge proportions. [=grew to be very serious]
The sky gradually assumed [=took on] an otherworldly glow.
Under certain conditions, the chemical will assume the appearance of ice.
4
a
: to make yourself have (an appearance that does not show your true feelings) in order to deceive someone
She immediately assumed a look of innocence. [=she had an expression on her face that made her look innocent, even though she wasn't]
b
: to place yourself in (a particular position or posture)
She assumed a sitting position [=she sat down] on the floor.
5
: to accept (a responsibility, debt, etc.)
When they purchased the company they had to assume [=take on] its debts.
assume liability
The city assumes greater financial risk with that plan.
Cite this Entry
“Assume.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/assume. Accessed 6 May. 2026.
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