Definify.com
Webster 1913 Edition
Milestone
Mile′stoneˊ
,Noun.
 1. 
A stone serving the same purpose as a milepost. 
Webster 1828 Edition
Milestone
MI'LESTONE
,Noun.
  Definition 2025
milestone
milestone
English
Noun
milestone (plural milestones)
- A stone milepost (or by extension in other materials), one of a series of numbered markers placed along a road at regular intervals, typically at the side of the road or in a median.
-  An important event in a person's life or career, in the history of a nation, in the life of some project, etc.
-  2012 March-April, Terrence J. Sejnowski, “Well-connected Brains”, in American Scientist, volume 100, number 2, page 171:- Creating a complete map of the human connectome would therefore be a monumental milestone but not the end of the journey to understanding how our brains work.
 
 
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Synonyms
Related terms
Translations
one of a series of numbered markers placed along a road at regular intervals
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important event
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Verb
milestone (third-person singular simple present milestones, present participle milestoning, simple past and past participle milestoned)