The Collaborative International Dictionary of English v.0.48:

jingoism \jin"go*ism\, n.
   1. The policy of the Jingoes, so called. See Jingo, 2.
      [Cant, Eng.]
      [1913 Webster]

   2. Hence: A bellicose patriotism; aggressive chauvinism;
      belligerence in international relations.
      [PJC]

WordNet (r) 3.0 (2006):

jingoism
    n 1: an appeal intended to arouse patriotic emotions [syn: flag
         waving, jingoism]
    2: fanatical patriotism [syn: chauvinism, jingoism,
       superpatriotism, ultranationalism]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "jingoism":
   Americanism, Anglicism, Briticism, aggression, aggressiveness,
   antagonism, bellicism, bellicosity, belligerence, belligerency,
   chauvinism, combativeness, contentiousness, ferocity, fierceness,
   fight, flag waving, flag-waving, hostility, love of country,
   martialism, militancy, militarism, nationalism, nationality,
   overpatriotism, patriotics, patriotism, pugnaciousness, pugnacity,
   quarrelsomeness, saber rattling, superpatriotism, truculence,
   ultranationalism, unfriendliness, unpeacefulness, warmongering,
   warpath