Definition of “assumption” - English Dictionary

“assumption” in British English

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assumptionnoun

uk /əˈsʌmp.ʃən/ us /əˈsʌmp.ʃən/

assumption noun (BELIEF)

C1 [ C ] something that you accept as true without question or proof:

People tend to make assumptions about you when you have a disability.
These calculations are based on the assumption that prices will continue to rise.

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(Definition of “assumption” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“assumption” in American English

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assumptionnoun

us /əˈsʌmp·ʃən/

assumption noun (ACCEPTING AS TRUE)

[ C ] a willingness to accept something as true without question or proof:

[ + that clause ] The plan was based on the assumption that the schedule could be substantially speeded up by adding more people.

assumption noun (CONTROL)

[ U ] the act of taking control or claiming authority:

Her assumption of the post of ambassador was a significant development.

(Definition of “assumption” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“assumption” in Business English

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assumptionnoun

uk /əˈsʌmʃən/ us

[ S ] something that you accept as true, although you have no proof:

make an assumption about sb/sth We tend to make assumptions about our staff's ability based on very little evidence.
on the assumption that They decided to go ahead on the assumption that the figures they had been given were accurate.
These calculations are based on the assumption that sales will continue to rise.

[ U ] the act of taking control of something:

the assumption of power by the army
The offer includes $1 billion in cash and the assumption of $3.5 billion in debt for TWA's aircraft leases.

(Definition of “assumption” from the Cambridge Business English Dictionary © Cambridge University Press)