American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Some may vacillate, hem and haw, or be wishy-washy about their views.— British Blogs
They vacillate, conforming now to the interest of the wage-workers, now to the interest of the employers.— Socialism A Summary and Interpretation of Socialist Principles
Why did Pilate waver, hesitate, vacillate, and at length yield contrary to his conscience and his will?— Jesus the Christ A Study of the Messiah and His Mission According to Holy Scriptures Both Ancient and Modern
Many begin by setting up proudly against God what they call the rights of reason, and by and by we see this reason, which has revolted against its Principle, vacillate, doubt of itself, and at last, losing itself in a bitter irony, wrap itself, with all beside, in the shroud of a universal scorn Without God reason is extinguished.— The Heavenly Father Lectures on Modern Atheism
During the course of subsequent events there were times when Bratianu to a certain extent seemed to vacillate, especially at the time of our great offensive against Russia.— Im Weltkriege. English

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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