Freebase(2.00 / 1 vote)Rate this definition: Proletariat. The proletariat is a term used to describe the class of wage-earners in a capitalist society whose only possession of significant material value is their labor; a member of such a class is a proletarian.
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A self-closing door mechanism or door closer is a device which is attached to the top of the door that pulls it shut when the door is released from the open position. This is achieved by means of an arm which rests against the door, which is connected either to a spring or pneumatic piston which pulls the door closed again.