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Supercharger. Digital image. Eaton, n.d. Web 28 March 2015  <http://www.eaton.com>

Supercharger

Forced Induction

Forced what???? Forced induction, that's what supercharger, turbo chargers and nitrous oxide do for an internal combustion engine.  If your car doesn't have forced induction (turbo/supercharger/nitrous) it's considered naturally aspirated.