Keywords: fast, rapid, rapidly, speed, speedily
As a Noun
The moving, doing or happening of something very quickly. English = speed, rapidity.
The act of moving very fast in a vehicle, usually a car, so that you are over the legal speed limit. English = speeding.
As a Verb or Adjective
To move, do something, or happen with great speed or very quickly. English = (be) fast, go fast, rush, speed.