The Collaborative International Dictionary of English v.0.48:

Collectivism \Col*lect"iv*ism\, n. [Cf. F. collectivisme.]
   (Polit. Econ.)
   The doctrine that land and capital should be owned by society
   collectively or as a whole; communism. --W. G. Summer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

collectivism
    n 1: Soviet communism [syn: Bolshevism, collectivism,
         sovietism]
    2: a political theory that the people should own the means of
       production

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "collectivism":
   Fabian socialism, Fabianism, Marxian socialism, Marxism, Nazism,
   Saint-Simonism, bipartisanship, centralism, coaction, coadjuvancy,
   coadministration, coagency, cochairmanship, codirectorship,
   collaboration, collaborativeness, collective farm,
   collective ownership, collectivity, collegiality, collusion,
   commensalism, common effort, common enterprise, common ownership,
   communal effort, communalism, communion, communism,
   communitarianism, community, complicity, concert, concord,
   concordance, concurrence, constitutionalism, cooperation,
   cooperative society, cooperativeness, democracy, democratism, duet,
   duumvirate, ecumenicalism, ecumenicism, ecumenism, esprit,
   esprit de corps, fascism, federalism, fellow feeling, fellowship,
   feudalism, feudality, governmentalism, guild socialism, harmony,
   imperialism, joining of forces, joint effort, joint operation,
   kibbutz, kolkhoz, mass action, monarchism, morale,
   mutual assistance, mutualism, mutuality, national socialism,
   nationalization, neofascism, octet, parliamentarianism,
   parliamentarism, phalansterism, pluralism, political principles,
   pooling, pooling of resources, profit sharing, public ownership,
   pulling together, quartet, quintet, reciprocity, republicanism,
   royalism, septet, sextet, sharecropping, socialism, solidarity,
   state ownership, state socialism, statism, symbiosis, synergism,
   synergy, team spirit, teamwork, town meeting, trio, triumvirate,
   troika, united action, utopian socialism