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

Over the years, Grey and Pollan have remained close, often supporting one another through personal and professional milestones. —Danielle Minnetian, FOXNews.com, 10 Feb. 2026

There are plenty of box office milestones to attach to Timothée Chalamet’s name. —Kate Erbland, IndieWire, 9 Feb. 2026

The Puerto Rican superstar's star-studded, moving performance marked another milestone in his banner year. —Jason Lamphier, Entertainment Weekly, 9 Feb. 2026

The Ablefly National Drone Soccer Championship Finals concluded on Sunday in Chengdu, marking a milestone for both competitive sports and the low-altitude economy. —Aamir Khollam, Interesting Engineering, 9 Feb. 2026

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