- a stone or pillar set up to show the distance in miles to or from a specified place
- a significant or important event in history, in the career of a person, etc.

Your twenty-first birthday is a milestone in your life.
- An example of a milestone is when the court makes a sweeping change in the civil rights law.
- An example of milestone is a person's 16th birthday.
The definition of a milestone is a notable event that causes some change to occur or that marks a specific point in the development of a person or project.
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milestone

Webster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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milestone

noun
- A stone marker set up on a roadside to indicate the distance in miles from a given point.
- An important event, as in a child's development, the history of a nation, or the advancement of knowledge in a field; a turning point.
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"Milestone." YourDictionary. LoveToKnow. www.yourdictionary.com/MILESTONE.
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Noun
(plural milestones)
Verb
(third-person singular simple present milestones, present participle milestoning, simple past and past participle milestoned)
- To place milestones along (a road, etc.).
- To plan out a project as a series of major steps.
English Wiktionary. Available under CC-BY-SA license.
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MLA Style
"Milestone." YourDictionary. LoveToKnow. www.yourdictionary.com/MILESTONE.
APA Style
Milestone. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/MILESTONE
Sentence Examples
- A milestone in a baby's life is when they learn how to walk.
- Graduation is a huge milestone in a young adult's life.
- The invention of the railroad was a milestone in the history of transportation.
- When writing her autobiography, Alice tried to highlight all of the milestones in her success.
- Do you remember what the milestone is to find the old country road?
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