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

First recorded in 1740–50; mile + stone Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for milestone

Contemporary Examples of milestone

Historical Examples of milestone

  • A few minutes later we found poor Villaret seated on a milestone.

    My Double Life

    Sarah Bernhardt

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

  • He sat down on the first milestone in the road, and meditated with his head in his hands.

    If Winter Don't

    Barry Pain

  • There is a rugged circular font, and what is supposed to be a Roman milestone.

    The Cornwall Coast

    Arthur L. Salmon

  • She sat in the carridge as silent as a milestone, and as madd as a march Air.


    William Makepeace Thackeray

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

Word Origin and History for milestone

1746, from mile + stone (n.).

Online Etymology Dictionary, © 2010 Douglas Harper