Definitions for "Normally aspirated"
An engine that is not equipped with a forced means of inducing air.
An engine that intakes air or "breathes" without the assistance of a supercharger or turbocharger. normally aspirated engine: An engine which uses the factory installed carburetor or fuel injection system with its normal air filter, etc. It does not use modified air flow systems which pump more air into the engine. Usually this expression is used as comparison as in My modified intake puts out more horsepower than a normally aspirated engine.
It is a sort of engine which can receive air or "breathes" without the help of a supercharger or turbocharger.