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From The Collaborative International Dictionary of English v.0.48:
Vacillation \Vac`il*la"tion\, n. [L. vacillatio: cf. F. vacillation.] 1. The act of vacillating; a moving one way and the other; a wavering. [1913 Webster] His vacillations, always exhibited most pitiably in emergencies. --Macaulay. [1913 Webster] 2. Unsteadiness of purpose; changeableness. [1913 Webster] There is a vacillation, or an alternation of knowledge and doubt. --Jer. Taylor. [1913 Webster]