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Webster 1913 Edition

Noun.

The quality or state of being vacillant, or wavering.

[R.]

Dr. H. More.

Noun.

[L. vacillans, from vacillo, to waver, Eng. to waggle, from the root of wag, which see.]

A state of wavering; fluctuation; inconstancy.

vacillancy

The quality or state of being vacillant, or wavering.
(Can we find and add a quotation of Dr. H. More to this entry?)