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diet

 
 
/daɪət/ noun

Definition

USUAL FOOD [C, U] the type of food that someone usually eats: His diet isn't very healthy.
SPECIAL FOOD [C] when someone eats less food, or only particular types of food, because they want to become thinner, or because they are ill: No cake for me, thanks - I'm on a diet.
(Definition of diet noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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