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milestone

[ mahyl-stohn ]
/ ˈmaɪlˌstoʊn /
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noun

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.

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Origin of milestone

First recorded in 1740–50; mile + stone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for milestone

milestone
/ (ˈmaɪlˌstəʊn) /

noun

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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