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]