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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IBM is a slowly progressive condition causing a gradual deterioration in muscle strength over the years. Most limb muscles can be affected. In particular the quadriceps (the thigh muscles which extend the knee joint), and forearm muscles that flex the wrists and fingers are commonly weak.