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prime

noun [S]
 
 
/praɪm/

Definition

the period in your life when you are most active or successful: This is a dancer in her prime. Middle age can be the prime of life if you have the right attitude. I suspect this cheese is past its prime.Stages of lifeHigher and lower points of achievementSuccess and achievementsFailures
(Definition of prime noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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