Source : Webster's Revised Unabridged Dictionary (1913)

Proletariat \Prol`e*ta"ri*at\, n. [F.]
   The indigent class in the State; the body of proletarians.

Source : WordNet®

proletariat
     n : a social class comprising those who do manual labor or work
         for wages; "there is a shortage of skilled labor in this
         field" [syn: {labor}, {labour}, {working class}]