Source : Webster's Revised Unabridged Dictionary (1913)

Opportunism \Op`por*tun"ism\, n. [Cf. F. opportunisme.]
   The art or practice of taking advantage of opportunities or
   circumstances, or of seeking immediate advantage with little
   regard for ultimate consequences. [Recent]

Source : WordNet®

opportunism
     n : taking advantage of opportunities without regard for the
         consequences for others [syn: {self-interest}, {self-seeking},
          {expedience}]