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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
Mission milestones The firsts began at launch.
—
Robert Z. Pearlman, Space.com, 7 Apr. 2026
North America has delivered the sequel’s most historic overseas performance, with the film surpassing the $25 million barrier to claim both the first-to-milestone and all-time market records.
—Naman Ramachandran, Variety, 6 Apr. 2026
Beyond distance, the mission also logged a symbolic milestone, with ground teams sending what is believed to be the longest person-to-person message ever transmitted, highlighting the evolving nature of human communication in deep space.
—Neetika Walter, Interesting Engineering, 6 Apr. 2026
More than a dozen films grossed over $100 million in China in 2017, but only two flicks have reached that milestone annually over the last several years.
—Alex Harring, CNBC, 6 Apr. 2026
See All Example Sentences for milestone
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Robert Z. Pearlman, Space.com, 7 Apr. 2026
North America has delivered the sequel’s most historic overseas performance, with the film surpassing the $25 million barrier to claim both the first-to-milestone and all-time market records.
—Naman Ramachandran, Variety, 6 Apr. 2026
Beyond distance, the mission also logged a symbolic milestone, with ground teams sending what is believed to be the longest person-to-person message ever transmitted, highlighting the evolving nature of human communication in deep space.
—Neetika Walter, Interesting Engineering, 6 Apr. 2026
More than a dozen films grossed over $100 million in China in 2017, but only two flicks have reached that milestone annually over the last several years.
—Alex Harring, CNBC, 6 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 8 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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