/ Dictionary / Index V vacillate: Meaning and Definition of Find definitions for: vac•il•late Pronunciation: (vas'u-lāt"), [key] — -lat•ed, -lat•ing. to waver in mind or opinion; be indecisive or irresolute: His tendency to vacillate makes him a poor leader. to sway unsteadily; waver; totter; stagger. to oscillate or fluctuate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vacillate (Thesaurus) vacillant vacillating Related Content Daily Word Quiz: banshee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language