American Dictionary of the English Language

Webster's Dictionary 1828

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VAC'ILLATE, verb intransitive [Latin vacillo; Eng. to waggle, a diminutive of wag. See Wag.]

1. To waver; to move one way and the other; to reel or stagger.

2. To fluctuate in mind or opinion; to waver; to be unsteady or inconstant.