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- milestone 1
milestone
noun
mile·stone
ˈmī(-ə)l-ˌstōn 
1
: a stone serving as a milepost (see milepost sense 1)
2
: a significant point in development
Graduating from college was an important milestone in her life.
Examples of milestone in a Sentence
the new drug was regarded as a milestone in the treatment of heart disease
Recent Examples on the Web
Rolls-Royce has begun testing its AE 1107 engine for prototypes of the US Army’s MV-75 Future Long-Range Assault Aircraft (FLRAA), marking a key milestone in the multibillion-dollar tiltrotor program.
—
Jijo Malayil, Interesting Engineering, 16 Dec. 2025
For Osmany Sigler and his wife, that milestone came after years of searching.
—Erika Gonzalez, CBS News, 16 Dec. 2025
So another milestone in my life.
—Clare Fisher, PEOPLE, 16 Dec. 2025
His next milestone came in 2020, when he was calculated to be worth at least $100 billion thanks to a soaring Tesla valuation.
—Emma Burleigh, Fortune, 16 Dec. 2025
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Jijo Malayil, Interesting Engineering, 16 Dec. 2025
For Osmany Sigler and his wife, that milestone came after years of searching.
—Erika Gonzalez, CBS News, 16 Dec. 2025
So another milestone in my life.
—Clare Fisher, PEOPLE, 16 Dec. 2025
His next milestone came in 2020, when he was calculated to be worth at least $100 billion thanks to a soaring Tesla valuation.
—Emma Burleigh, Fortune, 16 Dec. 2025
See All Example Sentences for milestone
Cite this Entry
“Milestone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/milestone. Accessed 20 Dec. 2025.
Copy CitationKids Definition
milestone
noun
mile·stone
ˈmī(ə)l-ˌstōn
1
: a milepost made of stone
2
: an important point in progress or development
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