Definition of milestone in English:

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Pronunciation: /ˈmʌɪlstəʊn/


1A stone set up beside a road to mark the distance in miles to a particular place.
Example sentences
  • A granite marker stone or milestone is preserved in Breage church.
  • Stuart now studies old Ordnance Survey maps, which mark the location of milestones with the letters MS, or MP for milepost.
  • The French twin town presented Ingleton with a milestone setting out the distance between the two.
2A significant stage or event in the development of something: the speech is being hailed as a milestone in race relations
More example sentences
  • Here are important milestones on the road leading up to the current situation.
  • It is not easy but represents a positive milestone on the long road to recovery.
  • Each of these are milestones on a road that's inexorably leading us into a one-way street from which there is no return.
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