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The Collaborative International Dictionary
Estuation

Estuation \Es`tu*a"tion\, n. [L. aestuatio.] The act of estuating; commotion, as of a fluid; agitation.

The estuations of joys and fears.
--W. Montagu. [1913 Webster] ||

Wiktionary
estuation

n. The act of estuate; commotion, as of a fluid; agitation.