/ Dictionary / Index V vaccination: Meaning and Definition of Find definitions for: vac•ci•na•tion Pronunciation: (vak"su-nā'shun), [key] — n. Med. the act or practice of vaccinating; inoculation with vaccine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vaccination (Thesaurus) vaccinate vaccinator Related Content Daily Word Quiz: beseech Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language