actor

noun7

1. •
   a person who plays characters in films, on television or on stage

   • Seems like everyone's an actor / Or they're an actor's best friend / I wonder what was wrong to begin with / That they should all have to pretend — 1991
2. •
   Someone or something that takes part in some action; a doer, an agent.

   • Never, my dear Bethel, did the most feverish dreams of fiction produce scenes more painful, or more terrific, than the real events to which I have been an actor, since the date of my last letter. — 1792
3. •
   The subject performing the action of a verb.
4. •
   The entity that performs a role (in use case analysis).
5. •
   (no longer used) Someone who institutes a legal suit; a plaintiff or complainant.
6. •
   (no longer used) Someone acting on behalf of someone else; a guardian.
7. •
   (no longer used) An advocate or proctor in civil courts or causes.