subs. (obsolete).1. In Eng. Hist. An agent, one who acts for others; a name given to the agents or delegates of the private soldiers in the Parliamentary Army, 16479; in which use it varied with ADJUTATOR (O.E.D.). [J. A. H. MURRAY: 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 1641.]
2. (common).A bell-rope, or knocker. TO AGITATE THE COMMUNICATOR = to ring the bell.