Source : Webster's Revised Unabridged Dictionary (1913)

Collectivist \Col*lect"iv*ist\, n. [Cf. F. collectiviste.]
   An advocate of collectivism. -- a. Relating to, or
   characteristic of, collectivism.

Source : WordNet®

collectivist
     adj : subscribing to the socialistic doctrine of ownership by the
           people collectively [syn: {collectivistic}, {collectivized},
            {collectivised}, {state-controlled}]

collectivist
     n : a person who belongs to the political left [syn: {leftist},
         {left-winger}]