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.

Illustration of milestone

• milestone 1

Synonyms of milestone

• climax
• landmark
• watershed
• corner

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

During the game, the Cowboys took to social media to announce that Prescott had surpassed a franchise great for a historic milestone. —Anne Erickson, MSNBC Newsweek, 18 Nov. 2025

Despite New York's reputation, Starship Bagel's doughy delights stole the show, marking a milestone for the North Texas shop and its loyal fans. —S.e. Jenkins, CBS News, 17 Nov. 2025

The cryptocurrency has hit a few stunning milestones in 2025. —Lee Ying Shan,dylan Butts, CNBC, 17 Nov. 2025

The holiday also means the annual Macy's Thanksgiving Day Parade, which is on the verge of a milestone in 2025. —Marina Johnson, Louisville Courier Journal, 17 Nov. 2025

Word History

First Known Use

1662, in the meaning defined at sense 1

Rhymes for milestone

• acetone
• anglophone
• baritone
• bourguignon
• buspirone
• chaperon
• chaperone
• cobblestone
• collarbone
• cornerstone
• cortisone
• dictaphone

Kids Definition

milestone

noun

mile·​stone ˈmī(ə)l-ˌstōn 

1

: a milepost made of stone

2

: an important point in progress or development