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

Flying Blue Program Turns 20 The loyalty program of Air France-KLM and several other airlines has reached its 20th milestone and is celebrating with numerous offers. —Ramsey Qubein, Forbes.com, 29 June 2025

In its second milestone in a week, Tesla arranged for a Model Y crossover to drive itself from its Texas factory to a customer in downtown Austin some 30 minutes away. —Christiaan Hetzner, Fortune, 28 June 2025

Now, he’s achieved the ultimate milestone – becoming an NHL player. —Jacob Lev, CNN Money, 28 June 2025

Today marks two racing milestones for my friend Jerry Bruckheimer, the release of F1 and the 35 year anniversary to the day of our collaboration with the great Tony Scott on Days of Thunder. —Saajan Jogia, MSNBC Newsweek, 28 June 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