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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
Kim, 45, marked her eldest sister’s milestone with a post on her main Instagram grid, sharing a series of snaps of the siblings from childhood to now.
—
Kirsty Hatcher, PEOPLE, 20 Apr. 2026
There were a couple milestones.
—Gabrielle Emanuel, NPR, 20 Apr. 2026
The Pitt is still reaching new milestones as its second season comes to an end.
—Katie Campione, Deadline, 20 Apr. 2026
The Orlando Storm continued their perfect season Saturday at Birmingham and in doing so, hit a pair of UFL milestones.
—Chris Hays, The Orlando Sentinel, 20 Apr. 2026
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Kirsty Hatcher, PEOPLE, 20 Apr. 2026
There were a couple milestones.
—Gabrielle Emanuel, NPR, 20 Apr. 2026
The Pitt is still reaching new milestones as its second season comes to an end.
—Katie Campione, Deadline, 20 Apr. 2026
The Orlando Storm continued their perfect season Saturday at Birmingham and in doing so, hit a pair of UFL milestones.
—Chris Hays, The Orlando Sentinel, 20 Apr. 2026
See All Example Sentences for milestone
Cite this Entry
“Milestone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/milestone. Accessed 22 Apr. 2026.
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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