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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
The milestone also brought to mind a funny moment William shared years ago about George’s birthday.
—
Janine Henni, People.com, 23 July 2025
Leading critics of the projects hailed Tuesday’s vote as a milestone in the fight to rein in San Diego’s unusually aggressive incentive for backyard apartments, which are formally called accessory dwelling units, or ADUs.
—David Garrick, San Diego Union-Tribune, 23 July 2025
The milestone comes about 7 months after the agency announced sales had surpassed the $7 billion mark, and on the heels of record-setting monthly sales in the most recent January, April, and May.
—Matthew Medsger, Boston Herald, 22 July 2025
The company has hit some milestones but has also been beset by problems, as three of the rockets launched from Texas this year have exploded—disrupting air traffic and raining debris on beaches and roads in the Caribbean and Gulf waters.
—ArsTechnica, 22 July 2025
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Janine Henni, People.com, 23 July 2025
Leading critics of the projects hailed Tuesday’s vote as a milestone in the fight to rein in San Diego’s unusually aggressive incentive for backyard apartments, which are formally called accessory dwelling units, or ADUs.
—David Garrick, San Diego Union-Tribune, 23 July 2025
The milestone comes about 7 months after the agency announced sales had surpassed the $7 billion mark, and on the heels of record-setting monthly sales in the most recent January, April, and May.
—Matthew Medsger, Boston Herald, 22 July 2025
The company has hit some milestones but has also been beset by problems, as three of the rockets launched from Texas this year have exploded—disrupting air traffic and raining debris on beaches and roads in the Caribbean and Gulf waters.
—ArsTechnica, 22 July 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 29 Jul. 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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