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From: Webster's Revised Unabridged Dictionary (1913)

 Vac·il·late v. i. [imp. & p. p. Vacillated p. pr. & vb. n. Vacillating.]
 1. To move one way and the other; to reel or stagger; to waver.
    [A spheroid] is always liable to shift and vacillatefrom one axis to another.   --Paley.
 2. To fluctuate in mind or opinion; to be unsteady or inconstant; to waver.
 Syn: -- See Fluctuate.