assumption · noun /əˈsʌmp.ʃən/Full view
C1 C something that you think is true without having any proof
Dictionary examples:

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.

Learner example:

But if this assumption is right, and if you consider how much fashion has changed over the last 60 years, does this mean that we are so very different from our grandparents? (Certificate in Advanced English; C1; German)

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