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milestone

[mahyl-stohn] /ˈmaɪlˌstoʊn/
noun
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
1740-1750
1740-50; mile + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for mile stone

milestone

/ˈmaɪlˌstəʊn/
noun
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
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Word Origin and History for mile stone

milestone

n.

1746, from mile + stone (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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