from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A motor vehicle brake assisted by a power mechanism operated by the engine that amplifies pressure applied to the brake pedal.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a brake on an automobile that magnifies a small force applied to the brake pedal into a proportionately larger force applied to slow or stop the vehicle
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