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

• 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

Someone tried to senselessly end her life, yet now thousands of people are cheering for her and celebrating every milestone. —Alyce Collins, MSNBC Newsweek, 1 Oct. 2025

The transaction marks another milestone in KKR’s expansion in the region. —Emma Graham, CNBC, 1 Oct. 2025

The pair both marked the milestone by sharing professional couple photos on Instagram, along with special tributes to each other. —Bailey Richards, PEOPLE, 30 Sep. 2025

KPop Demon Hunters reached yet another milestone last week, becoming Netflix’s longest-running English film title to remain in the Top 10. —Katie Campione, Deadline, 30 Sep. 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