Lewis Short
ăgĭtātor (noun M) : id., pr.
* He that puts a thing in motion; used exclusively of those who drive animals (asses, horses, etc.), a driver (cf. agaso): agitator aselli, poet. for a peasant, Verg. G. 1, 273: equorum Achillis,i. e. the charioteer,id. A. 2, 476: sustineat currum ut bonu' saepe agitator equosque,Lucil. p. 154 Müll.—Hence
* Esp., a charioteer, a combatant in the games of the circus, Plaut. Men. 1, 2, 50: ego ut agitator callidus, priusquam ad finem veniam, equos sustinebo,Cic. Ac. 2, 20; Suet. Calig. 55; so Inscr. Orell. 2593 sq.: agitatores consopiti sunt,Vulg. Nah. 2, 3.
Charlton T. Lewis, Charles Short, A Latin Dictionary