Definitions from Wiktionary (actor)

▸ noun:  (obsolete, law) Someone who institutes a legal suit; a plaintiff or complainant.
▸ noun:  (obsolete) Someone acting on behalf of someone else; a guardian.
▸ noun:  Someone or something that takes part in some action; a doer, an agent.
▸ noun:  A person who acts a part in a theatrical play or (later) in film or television; a dramatic performer.
▸ noun:  (obsolete, Ancient Rome) An advocate or proctor in civil courts or causes.
▸ noun:  (grammar) The subject performing the action of a verb.
▸ noun:  (software engineering) The entity that performs a role (in use case analysis).

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