milestone

[mahyl-stohn]
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:
1740–50; mile + stone

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World English Dictionary
milestone (ˈmaɪlˌstəʊn)
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

milestone
1746, from mile + stone (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Whatever else happened, the milestone of completing the doctorate would buoy my
  spirits.
But its significance is deeper and wider than that of being a mere historical
  milestone.
Mapping milestone emphasizes complexity of disease.
It seems only reasonable that there would be some type of publicity for this
  milestone.
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