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celer- (Latin: fast, speed, swift, rapid).

Compare this with brady- for words with opposite meanings.

accelerant:
A substance that is used to intensify a fire.
accelerate, accelerated:
1. To move increasigly quickly, or cause something to move faster.
2. To happen or develop faster, or cause something to happen or develop faster.
acceleration:
1. The rate at which something increases in velocity.
2. An increase in the rate at which something happens or develops.
accelerator:
1. A pedal or other control mechanism used to cause a vehicle to increase speed.
2. LA machine used to increase the velocity, and hence the kinetic energy, of subatomic particles or nuclei, usually in preparation for collision with a target.
accelerograph:
An instrument for recording the acceleration of earth-tremors.
accelerometer:
1. An instrument or device for measuring acceleration or speed.
2. An instrument for ascertaining the acceleration of a moving body or for measuring mechanical vibrations.
celeripedean:
A fast runner; swift footed.
celerity:
Swiftness, speed. Now chiefly (as distinguished from velocity) with reference to the movements or actions of living beings.
decelerate, deceleration:
To diminish the speed of; to cause to go slower.
decelerator:
An apparatus for reducing the speed of an engine.
decelerometer:
An instrument for ascertaining the deceleration of a moving body.