GNU Collaborative International Dictionary of English

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1.       
   Vacillate , v. i. [imp. & p. p. Vacillated ; p. pr. & vb. n. Vacillating.] [L. vacillare, vacillatum; cf. Skr. vañc.]
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   To move one way and the other; to reel or stagger; to waver.
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   [A spheroid] is always liable to shift and vacillatefrom one axis to another.
   Paley.
   
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   To fluctuate in mind or opinion; to be unsteady or inconstant; to waver.
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   Syn. -- See Fluctuate.
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