mile·​stone ˈmī(-ə)l-ˌstōn How to pronounce milestone (audio)
: a stone serving as a milepost (see milepost sense 1)
: a significant point in development
Graduating from college was an important milestone in her life.

Illustration of milestone

Illustration of milestone
  • milestone 1

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 Related article Historic Odysseus moon mission marks a milestone in reaching the lunar surface The names of the craft were picked by a group of experts from nearly 2,000 proposals solicited from the public, according to the space agency. Simone McCarthy, CNN, 26 Feb. 2024 Millions of borrowers have been approved for student loan forgiveness under several Biden administration initiatives, according to the Education Department, while officials just reached a major milestone in developing a brand new student debt relief plan. Adam S. Minsky, Forbes, 26 Feb. 2024 Germany leaves Turin with the most overall medals with 29, 11 of them gold, while the Americans win 25 medals overall, including nine gold. 2007 — Roger Federer reaches a new milestone breaking Jimmy Connors’ 30-year-old mark with his 161st week at the top of the ATP rankings. Houston Mitchell, Los Angeles Times, 26 Feb. 2024 On Friday, Teigen, 38, posted two sweet videos of son Wren Alexander on her Instagram Story, revealing his latest milestone — learning to walk. Jenny Haward, Peoplemag, 24 Feb. 2024 Still, there is plenty of progress to be made — and plenty of milestones to build upon. Alex Zietlow, Charlotte Observer, 23 Feb. 2024 Tedi has accomplished a series of milestones in her career that reflect her mastery of the beauty industry and medical aesthetics. Molly Peck, The Arizona Republic, 23 Feb. 2024 The excitement of last weekend’s start of the J.D. Arteaga era was tempered Wednesday night by the reality of another milestone for the Miami Hurricanes’ first-year coach: a loss. Susan Miller Degnan, Miami Herald, 22 Feb. 2024 Perhaps most impressively, Ice Spice has achieved all of these milestones without an official studio album. Kyle Denis, Billboard, 22 Feb. 2024 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'milestone.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1662, in the meaning defined at sense 1

Time Traveler
The first known use of milestone was in 1662

Dictionary Entries Near milestone

Cite this Entry

“Milestone.” Dictionary, Merriam-Webster, Accessed 1 Mar. 2024.

Kids Definition


mile·​stone ˈmī(ə)l-ˌstōn How to pronounce milestone (audio)
: a milepost made of stone
: an important point in progress or development

More from Merriam-Webster on milestone

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