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[mahyl-stohn] /ˈmaɪlˌstoʊn/
a stone functioning as a milepost.
a significant event or stage in the life, progress, development, or the like of a person, nation, etc.:
Her getting the job of supervisor was a milestone in her career.
Origin of milestone
1740-50; mile + stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for milestone
Contemporary Examples
Historical Examples
  • "There are so many other ruins from the days, of ancient Rome, that you will never miss the milestone," Rafael assured her.

    Rafael in Italy Etta Blaisdell McDonald
  • A few minutes later we found poor Villaret seated on a milestone.

    My Double Life Sarah Bernhardt
  • He ended his days at an estate he had at the eighth milestone on the Appian Way.

  • Ten minutes beyond Soof we had a Roman milestone lying at our feet.

  • You must unchain the dog and take him to the milestone by the crossroads.

    Harding's luck E. [Edith] Nesbit
British Dictionary definitions for milestone


a stone pillar that shows the distance in miles to or from a place
a significant event in life, history, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for milestone

1746, from mile + stone (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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