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English definition of “good”

good

adjective (POSITIVE)    /ɡʊd/ (better, best)
A1 having a positive or useful effect , especially on the health : Make sure you eat plenty of good fresh food . Too much sugar in your diet isn't good for you. It's good for old people to stay active if they can.Useful or advantageousFit and healthy
(Definition of good adjective (POSITIVE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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