pacer

noun

pac·​er ˈpā-sər 

1

: one that paces

specifically : a horse whose predominant gait is the pace

2

: pacemaker

Synonyms

• leader
• pacemaker

Examples of pacer in a Sentence

a highly competitive industry in which any company that isn't a pacer quickly becomes a belly-up also-ran

Recent Examples on the Web

Andrew Boyd has been there for each of Frederick’s Badwater races, encouraging her from the support vehicle, running alongside her as a pacer. —Devin Kelly, Outside Online, 29 July 2025

Between fans screaming her name, the looming clock, and the global livestream, there was something palpably electric (and truly nerve-wracking) about watching Kipyegon take her place on the track alongside 13 world-class athletes, pacers who were positioned to help push Kipyegon forward. —L'oréal Blackett, Refinery29, 30 June 2025

Moreover, the pacers weren’t particularly close to Kipyegon. —Alex Hutchinson, Outside Online, 30 June 2025

The pacers included Grant Fisher, an American two-time Olympic bronze medalist. —Andrew Greif, NBC news, 26 June 2025

Word History

First Known Use

1616, in the meaning defined at sense 1

Rhymes for pacer

• acer
• baser
• chaser
• racer
• spacer
• tracer
• eraser
• replacer
• radiotracer

Medical Definition

pacer

noun

pac·​er ˈpā-sər 

: pacemaker sense 2

electronic cardiac pacers