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Noun: milestone  'mI(-u)l,stown
  1. A significant event in your life (or in a project)
    "Graduating from college was a major milestone in her life"
     
  2. Stone post at side of a road to show distances
    "The old milestone indicated we were 10 miles from the city";
    - milepost

Derived forms: milestones

Type of: juncture, mark, marker, marking, occasion

Encyclopedia: Milestone, Virginia