C1 a part or share of something larger一部分;一份
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(食物的)一份,一客
More examples
She donated a sizeable portion of her riches to children's charities.
A good rule of thumb is that a portion of rice is two and a half handfuls.
Just a modest portion for me, please.
The school would only receive a very small portion of the profits.
A very large portion of our income goes to pay the mortgage.
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