Pronunciation: (vak'su-nāt"), [key]
—v., -nat•ed, -nat•ing. Med.
1. to inoculate with the vaccine of cowpox so as to render the subject immune to smallpox.
2. to inoculate with the modified virus of any of various other diseases, as a preventive measure.
to perform or practice vaccination.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.