Milestone

[mahyl-stohn] /ˈmaɪlˌstoʊn/

noun
1.
a 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.
/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
n.

1746, from mile + stone (n.).

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