Source : Webster's Revised Unabridged Dictionary (1913)

Vaccination \Vac`ci*na"tion\, n.
   The act, art, or practice of vaccinating, or inoculating with
   the cowpox, in order to prevent or mitigate an attack of
   smallpox. Cf. {Inoculation}.

Source : WordNet®

vaccination
     n 1: taking a vaccine as a precaution against contracting a
          disease [syn: {inoculation}]
     2: the scar left following innoculation with a vaccine