I. One who drives or moves something: “pecoris actor,” Ov. H. 1, 95: “habenae,” a slinger, Stat. Ach. 2, 419.—
II. In gen., he who does any thing, a doer or performer (cf. ago, II.).
A. In gen. of every kind of action: “ut illum efficeret oratorem verborum actoremque rerum,” Cic. de Or. 3, 15, 57 (a translation of the Homer. πρηκτῆρα ἔργων, Il. 9, 443): “Cato dux, auctor, actor rerum illarum fuit,” id. Sest. 28 fin.; so Caes. B. C. 1, 26; Nep. Att. 3, 2 al.—
B. In judicial lang., one who brings an action, a plaintiff: “accusatorem pro omni actore et petitore appello,” Cic. Part. 32; “esp. of lawyers: Moloni Rhodio et actori summo causarum et magistro,” id. Brut. 89 fin.; so Hor. A. P. 369 al.—Also, one who conducts a suit, an advocate, Cic. Caec. 1.—Hence,
C. At a later period, an agent or attorney; in gen., an administrator or manager or steward, overseer of property or an estate.—So in Tac.: actor publicus, he who administers the public property, Ann. 2, 30; 3, 67: actor summarum, a keeper of accounts or cashier, Suet. Dom. 11, and so often in the Dig.: sub actoribus, overseers (of a household), Vulg. Gal. 4, 2.—
D. In rhetor. lang., one who delivers any oral discourse; and esp. one who delivers an oration, an orator: “inventor, compositor, actor,” Cic. Or. 19.—