Pronunciation: /əˈsʌmpʃən/
noun a thing that is accepted as true or as certain to happen, without proof
A1 I made the assumption that the store would be open until 9pm.
A2 She based her decision on the assumption that he would be there to help.
B1 The project's success was built on the assumption that the market would respond positively.
B2 It is dangerous to make assumptions about someone's intentions without knowing the full story.
C1 The scientific community questioned the validity of the assumption made in the research paper.
C2 The CEO's decision was influenced by his underlying assumptions about the company's future growth.
adjective relating to or based on an assumption
A1 She made an assumption that the store would be open until 9pm.
A2 The students worked on a project based on the assumption that they would have access to a computer lab.
B1 The decision was made under the assumption that the economy would continue to grow.
B2 The success of the marketing campaign was built on the assumption that customers would respond positively to the new product.
C1 The scientist's theory was based on the assumption that light behaves both as a wave and a particle.
C2 The CEO's strategy relied heavily on the assumption that the merger would result in increased profits for the company.
formal The research study was based on the assumption that all participants were honest in their responses.
informal Don't make assumptions about people you don't know well.
slang I jumped to conclusions without knowing the full story.
figurative She built her entire argument on the shaky assumption that everyone agreed with her.
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