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vacillation (n.)

c. 1400, "hesitation, uncertainty," from Latin vacillationem (nominative vacillatio) "a reeling, wavering," noun of action from past-participle stem of vacillare "sway to and fro, waver, hesitate, be untrustworthy," of uncertain origin. Originally in reference to opinion or conduct; literal sense is recorded from 1630s.

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Definitions of vacillation from WordNet

vacillation (n.)
indecision in speech or action;
Synonyms: hesitation / wavering
vacillation (n.)
changing location by moving back and forth;
Synonyms: swing / swinging
From wordnet.princeton.edu