/ Dictionary / Index I invigorant: Meaning and Definition of Find definitions for: in•vig•or•ant Pronunciation: (in-vig'ur-unt), [key] — n. a tonic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. invigilate invigorate Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language