1. Verb.  (transitive, immunology) To introduce an antigenic substance or vaccine into the body to produce immunity to a specific disease.
  2. Verb.  (transitive, by extension) To safeguard or protect something as if by inoculation.
  3. Verb.  To add one substance to another. To spike.

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This entry was last updated on RefTopia from its source on 3/20/2012.