accelerator

noun

ac·​cel·​er·​a·​tor ik-ˈse-lə-ˌrā-tər 

ak-

plural accelerators

: one that accelerates: such as

a

: a muscle or nerve that speeds the performance of an action

b

: a device (such as a gas pedal) for increasing the speed of a motor vehicle engine

c

: a substance that speeds a chemical reaction

d

: an apparatus for imparting high velocities to charged particles (such as electrons)

e

: an item of computer hardware that increases the speed at which a program or function operates

a graphics accelerator

Examples of accelerator in a Sentence

Recent Examples on the Web

What remains deeply felt in his video is that China looms in the rearview—with the country possessing a vast manufacturing machine that dominates the electric car market and is now aimed at mastering autonomous vehicles—and that the U.S. cannot lift its foot off the accelerator. —Deni Ellis Béchard, Scientific American, 2 May 2025

Proof of Concept, an accelerator program supporting women, trans and nonbinary filmmakers founded by Oscar winner Cate Blanchett, producer Coco Francini and noted researcher Dr. Stacy L. Smith, debuted the work of its inaugural class at a showcase on Tuesday night in Los Angeles. —Angelique Jackson, Variety, 30 Apr. 2025

Gradually ease off the accelerator and avoid abrupt braking to prevent skidding. —Bay Area Weather Report, Mercury News, 30 Apr. 2025

Earned Media and Online Presence Thought leadership that inspires trust and acts as a business accelerator can come in many forms, including public speaking, podcasts, writing a book, or being an expert source for news articles or trade publications. —Adam Witty, Forbes.com, 30 Apr. 2025

Word History

Etymology

accelerate + -or entry 1

First Known Use

1611, in the meaning defined above

Phrases Containing accelerator

• accelerator mass spectrometry
• linear accelerator
• particle accelerator

Rhymes for accelerator

• accumulator
• adjudicator
• administrator
• appropriator
• articulator
• attenuator
• bronchodilator
• collaborator
• communicator
• conciliator
• cooperator
• coordinator

Kids Definition

accelerator

noun

ac·​cel·​er·​a·​tor ik-ˈsel-ə-ˌrāt-ər 

ak-

1

: one that accelerates

2

: a device (as a pedal) in a motor vehicle used to control the speed of the motor

3

: a device that is used to give high velocities to charged particles (as electrons and protons)

Medical Definition

accelerator

noun

ac·​cel·​er·​a·​tor ik-ˈsel-ə-ˌrāt-ər, ak- 

: one that accelerates: as

a

: a muscle or nerve that speeds the performance of an action

a cardiac accelerator

b

: a substance that speeds a chemical reaction

c

: an apparatus for imparting high velocities to charged particles (as electrons)