An act of acceleration.

present participle of accelerate

plural of accelerating

One who, or that which, accelerates. / A device for causing acceleration. / (chemistry) A substance which speeds up chemical reactions.

(uncountable) The act of accelerating, or the state of being accelerated; increase of motion or action; as opposed to retardation or deceleration.

(rare) Accelerated; quickened; hastened; hurried.

(transitive) To cause to move faster; to quicken the motion of; to add to the speed of. / (transitive) To quicken the natural or ordinary progression or process of.

plural of accelerant

Able to be given increased speed; able to be accelerated.

In the context of fire protection, a substance that accelerates the development of a fire, especially some hydrocarbon-based fuel used to spread a fire caused by arson.