[ mahyl-stohn ]
See synonyms for: milestonemilestones on

  1. a stone functioning as a milepost.

  2. 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

Words Nearby milestone Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use milestone in a sentence

British Dictionary definitions for milestone


/ (ˈmaɪlˌstəʊn) /

  1. a stone pillar that shows the distance in miles to or from a place

  2. 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