Definition of milestone noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈmaɪlstəʊn//
    ; NAmE NAmE//ˈmaɪlstoʊn//
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  1. 1(also milepost especially in North American English) a very important stage or event in the development of something synonym landmark This voyage marked an important milestone in the history of exploration. Today we have passed another milestone on the road towards peace.
  2. 2a stone by the side of a road that shows how far it is to the next town and to other places
  3. Extra examples The company passed the £6 million milestone this year. The film proved to be a milestone in the history of cinema. a milestone for Chinese technology another grim milestone in the war
See the Oxford Advanced American Dictionary entry: milestone