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

• climacteric
• climax
• corner
• landmark
• milepost
• turning point
• watershed

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

That milestone would place him alongside names like Kyle Busch, Denny Hamlin, Joey Logano, and Brad Keselowski. —Greg Engle, Forbes, 13 Mar. 2025

Francis on Thursday marks an important milestone: the 12th anniversary of his election as pope. —Compiled By Democrat-Gazette Staff From Wire Reports, arkansasonline.com, 13 Mar. 2025

That marks another milestone in the pullback that has gripped investors over the past three weeks as President Donald Trump’s on-again-off-again tariff policy drove up uncertainty and market volatility. —Alex Harring, CNBC, 13 Mar. 2025

This performance marked her first full concert since July 2023, symbolizing a significant milestone in her comeback. —Okla Jones, Essence, 13 Mar. 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