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English definition of “portion”

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portion

noun [C] uk   /ˈpɔː.ʃən/ us    /ˈpɔːr-/
C1 a part or share of something larger: A large/major portion of the company's profit goes straight back into new projects. I accept my portion of the blame.B2 the amount of a particular food that is served to one person, especially in a restaurant or a shop that sells food ready to be eaten: The portions are very generous in this restaurant.
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(Definition of portion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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