milestone - definition and synonyms

noun [countable] 

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/ˈmaɪlˌstəʊn/
singularmilestone
pluralmilestones
  1. 1
    an event or achievement that marks an important stage in a process

    This film was a milestone in the history of cinema.

  2. 2
    a stone at the side of a road that shows the distance to a particular place