The Collaborative International Dictionary of English v.0.48:

Vaccinate \Vac"ci*nate\, v. t. [imp. & p. p. Vaccinated; p.
   pr. & vb. n. Vaccinating.] [See Vaccine.]
   To inoculate with the cowpox by means of a virus, called
   vaccine, taken either directly or indirectly from cows; now,
   generally, to administer (by injection or otherwise) any
   vaccine with the objective of rendering the recipient immune
   to an infectious disease. One who has been thus immunized by
   vaccination is said to be

   vaccinated against a particular disease. One may be thus
      immunized (vaccinated) also by oral ingestion or
      inhalation of a vaccine.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

vaccinated
    adj 1: having been rendered unsusceptible to a disease [syn:
           immunized, immunised, vaccinated]