• A person who performs, plays a part in a theatrical play or film.
  • One who acts; a doer.
  • One who takes part in a situation.
  • An advocate or proctor in civil courts or causes.
  • One who institutes a suit; plaintiff or complainant.
  • One who enacts a certain policy action.
  • The entity that performs a role (in use case analysis).
  • The most agent-like argument of a clause, e.g. 'the torpedo' in "The torpedo sank the boat" and "The torpedo fired".


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  • From Middle English actour, from Latin āctor ("doer"), from agō. Equivalent to act + -or. Cognate with Ancient Greek ἄκτωρ ("leader"), from ἄγω.

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