Meaning of “portion” in the English Dictionary

american-english dictionary
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"portion" in British English

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portionnoun [ C ]

uk /ˈpɔː.ʃən/ us /ˈpɔːr.ʃən/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"portion" in American English

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portionnoun [ C ]

us /ˈpɔr·ʃən, ˈpoʊr-/

a part or share of something larger:

She read large portions of the manuscript and offered many useful suggestions.
A portion of my paycheck was withheld for taxes.

A portion is also the amount of food served to or suitable for a person:

They serve children’s portions at half-price.

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

"portion" in Business English

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portionnoun [ C ]

uk /ˈpɔːʃən/ us

a part or share of something larger:

A large portion of the company's profits is ploughed back into new projects.
These products account for a relatively small portion of sales.

COMMERCE the amount of a particular food that is enough for one person, especially in a restaurant, etc.:

Bar food, lunchtime and evening, comes in generous portions.
They kept their costs down by minimizing waste and having strict portion control.

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