/ Dictionary / Index V vaccinate: Meaning and Definition of Find definitions for: vac•ci•nate Pronunciation: (vak'su-nāt"), [key] — v., -nat•ed, -nat•ing. —v.t. to inoculate with the vaccine of cowpox so as to render the subject immune to smallpox. to inoculate with the modified virus of any of various other diseases, as a preventive measure. —v.i. to perform or practice vaccination. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vaccinate (Thesaurus) vaccinal vaccination Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language