Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: assumere, from ad- 'to' + sumere 'to take'

assume

verb
     
as‧sume S1 W1 [transitive]
1 to think that something is true, although you do not have definite proof [= presume]
assume (that)
I didn't see your car, so I assumed you'd gone out.
it is/seems reasonable to assume (that)
It seems reasonable to assume that the book was written around 70 AD.
I think we can safely assume (=it is almost certain) that interest rates will go up again soon.
let us/let's assume (that) (=used when thinking about a possible event or situation and its possible results)
Let us assume for a moment that we could indeed fire her. Should we?
When it got to midnight and Paul was still not back, I began to assume the worst (=think that the worst possible thing had happened).
2

assume control/responsibility etc

formal to start to have control, responsibility etc or to start in a particular position or job:
Whoever they appoint will assume responsibility for all financial matters.
He assumed power in a bloody coup in 1990.
Jim Paton will assume the role of managing director.
3

assume a manner/air/expression etc

formal to behave in a way that does not show how you really feel, especially in order to seem more confident, happy etc than you are [= put on]:
Andy assumed an air of indifference whenever her name was mentioned.
4 to start to have a particular quality or appearance [= take on]:
These relationships assume great importance in times of crisis.
The problem is beginning to assume massive proportions.
5 to be based on the idea that something else is correct [= presuppose]
assume (that)
The theory assumes that both labour and capital are mobile.
Coen's economic forecast assumes a 3.5% growth rate.

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