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English definition of “milestone”

milestone

noun [C] uk   /ˈmaɪl.stəʊn/ us    /-stoʊn/ (UK also milepost)

milestone noun [C] (STONE/POST)

a stone or post at the side of the road that shows the distance to various places, especially to the nearest large townLights, signs and markings on roads

milestone noun [C] (IMPORTANT EVENT)

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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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