Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A theatrical performer.
  • n. One who takes part; a participant: "France, Britain . . . and any other external actors now involved . . . in the affairs of the continent” ( Helen Kitchen).
  • n. Law One, such as the manager of a business, who acts for another.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person who performs in a theatrical play or film.
  • n. One who acts; a doer.
  • n. One who takes part in a situation.
  • n. An advocate or proctor in civil courts or causes.
  • n. One who institutes a suit; plaintiff or complainant.
  • n. One who enacts a certain policy action.
  • n. The entity that performs a role (in use case analysis).

from the GNU version of the Collaborative International Dictionary of English

  • n. One who acts, or takes part in any affair; a doer.
  • n. A theatrical performer; a stageplayer.
  • n.
  • n. An advocate or proctor in civil courts or causes.
  • n. One who institutes a suit; plaintiff or complainant.

from The Century Dictionary and Cyclopedia

  • n. One who acts or performs; the doer or performer of an action; specifically, one who represents a character or acts a part in a play; a stage-player.
  • n. In law: An advocate or a proctor in civil courts or causes.
  • n. A plaintiff.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a person who acts and gets things done
  • n. a theatrical performer

Etymologies

Middle English actour, doer, probably from Latin āctor, from āctus, past participle of agere, to drive, do.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin āctor ("doer"), from agere ("to do"). Cognate with Ancient Greek ἄκτωρ (aktōr, "leader"), from ἄγω (agō, "lead, carry, convey, bring"). (Wiktionary)

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