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English definition of “proposition”

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proposition

noun [C] uk   /ˌprɒp.əˈzɪʃ.ən/ us    /ˌprɑː.pə-/
C1 an offer or suggestion, usually in business: He wrote to me last week regarding a business proposition he thought might interest me. I've put my proposition to the company director for his consideration. an idea or opinion: They were debating the proposition that "All people are created equal".
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proposition

verb [T] uk   /ˌprɒp.əˈzɪʃ.ən/ us    /ˌprɑː.pə-/
to ask someone who you are not in a relationship with if they would like to have sex with you: I was propositioned by a complete stranger.
(Definition of proposition from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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