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English definition of “milestone”

milestone

noun [C] (IMPORTANT EVENT)    /ˈmaɪl.stəʊn/ US  /-stoʊn/ (UK also milepost)
an important event in the development or history of something or in someone's life: He felt that moving out from his parents' home was a real milestone in his life.Events and occurrencesAccidents and disastersTurning points and deciding moments
(Definition of milestone noun (IMPORTANT EVENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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