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English definition of “life cycle”

life cycle

noun [C usually singular]    
the series of changes that a living thing goes through from the beginning of its life until death: They studied the life cycle of the frog.Life and living the length of time that something lasts or can be used: Many of these technological products have only a very short life cycle.
(Definition of life cycle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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