a mechanism for forcing air into an internal-combustion engine in order to increase engine power.

1920–25; supercharge + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
supercharger (ˈsuːpəˌtʃɑːdʒə)
blower, Also called: booster a device, usually a fan or compressor driven by the engine, that increases the mass of air drawn into an internal-combustion engine by raising the intake pressure

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The simple version of your proposal is a turbocharger or supercharger that pressurizes incoming air.
Gesner's father, an engineer, was responsible for the automobile supercharger.
The supercharger, also called a centrifugal compressor, draws air through an inlet.
Leaded gas improved an aircraft engine's performance by enabling it to use a supercharger more effectively while using less fuel.
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