Source : Webster's Revised Unabridged Dictionary (1913)

Proletarian \Prol`e*ta"ri*an\, a. [L. proletarius. See
   Proletary.]
   Of or pertaining to the proletaries; belonging to the
   commonalty; hence, mean; vile; vulgar. ``Every citizen, if he
   were not a proletarian animal kept at the public cost.'' --De
   Quincey. -- n. A proletary.

Source : WordNet®

proletarian
     adj 1: the lowest class of citizens of ancient Rome who had no
            property [syn: {propertyless}] [ant: {patrician}, {plebeian}]
     2: belonging to or characteristic of the proletariat
     n : a member of the working class (not necessarily employed);
         "workers of the world--unite!" [syn: {prole}, {worker}]