n. One who or that which agitates. Specifically—n. A machine for agitating and mixing; specifically, a machine for stirring pulverized ore in water.n. A name given to certain officers appointed by the army of the English Commonwealth in 1647-9 to manage their concerns. There were two from each regiment.n. [It has been supposed that in this sense the proper spelling of the word is adjutator, meaning not one who agitates, but one who assists. But Dr. J. A. H. Murray says: “Careful investigation satisfies me that Agitator was the actual title, and Adjutator originally only a bad spelling of soldiers familiar with Adjutants and the Adjutors of 1642.”]