mile·​stone | \ ˈmī(-ə)l-ˌstōn How to pronounce milestone (audio) \

Essential Meaning of milestone

1 : a stone by the side of a road that shows the distance in miles to a specified place
2 : an important point in the progress or development of something : a very important event or advance

Full Definition of milestone

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.

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 LaDainian Tomlinson becomes the 23rd player in NFL history rush for 10,000 yards, reaching the milestone on a 36-yard run in the Chargers’ 32-14 win over Baltimore. Los Angeles Times, 25 Nov. 2021 Purina is adding a second dog show to celebrate the 20-year milestone, new this year will be the National Dog Show Jr. which will be streaming on Peacock at 2 p.m. Travel + Leisure, 25 Nov. 2021 The guard entered the game just one point away from the milestone. Mark Didtler, ajc, 25 Nov. 2021 Stars Daniel Radcliffe, Rupert Grint, Emma Watson, Tom Felton and more of the Hogwarts gang will travel back to the magical school with filmmaker Chris Columbus for an HBO Max special to celebrate the magical milestone. Staff And Wire Reports, USA TODAY, 25 Nov. 2021 The mayor announced the milestone Tuesday morning near Young’s Mart convenience store in the Stockton neighborhood. San Diego Union-Tribune, 23 Nov. 2021 Swift thanked the fans for the milestone on Monday. Lauren Huff,, 22 Nov. 2021 Animal Planet's Puppy Bowl is coming back for its 18th year in February 2022, and the event is celebrating the milestone in a unique way. Kelli Bender,, 22 Nov. 2021 Mixon needed just five rushing yards to reach the milestone, doing so in just 60 career games over five seasons in Cincinnati. Dave Clark, The Enquirer, 21 Nov. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'milestone.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of milestone

1662, in the meaning defined at sense 1

Learn More About milestone

Time Traveler for milestone

Time Traveler

The first known use of milestone was in 1662

See more words from the same year

Dictionary Entries Near milestone

Milesian tale



See More Nearby Entries 

Statistics for milestone

Last Updated

30 Nov 2021

Cite this Entry

“Milestone.” Dictionary, Merriam-Webster, Accessed 6 Dec. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for milestone


mile·​stone | \ ˈmīl-ˌstōn How to pronounce milestone (audio) \

Kids Definition of milestone

1 : a stone by the side of a road showing the distance in miles to a given place
2 : an important point in progress or development His discovery was a major milestone in scientific research.

More from Merriam-Webster on milestone

Nglish: Translation of milestone for Spanish Speakers

Britannica English: Translation of milestone for Arabic Speakers


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Spell It

Can you spell these 10 commonly misspelled words?

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!