actor

[ak-ter]
noun
1.
a person who acts in stage plays, motion pictures, television broadcasts, etc.
2.
a person who does something; participant.

Origin:
1350–1400; Middle English < Latin āctor, equivalent to āg- (see act) + -tor -tor

nonactor, noun
Dictionary.com Unabridged

Actor

[ak-ter]
noun Classical Mythology.
a brother of King Augeas, sometimes believed to be the father, by Molione, of Eurytus and Cteatus.
Compare Moliones.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
actor (ˈæktə)
 
n
1.  a person who acts in a play, film, broadcast, etc
2.  informal a person who puts on a false manner in order to deceive others (often in the phrase bad actor)
 
usage  The term actor is almost universally used nowadays to refer to people of either gender who act

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

actor
late 14c., "an overseer, a plaintiff," from L. actor "an agent or doer," from pp. stem of agere (see act). Sense of "one who performs in plays" is 1580s, originally applied to both men and women.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

Actors definition

theory
A model for concurrency by Carl Hewitt. Actors are autonomous and concurrent objects which execute asynchronously. The Actor model provides flexible mechanisms for building parallel and distributed software systems.
(http://osl.cs.uiuc.edu/).
["Laws for Communicating Parallel Processes", C. Hewitt et al, IFIP 77, pp. 987-992, N-H 1977].
["ACTORS: A Model of Concurrent Computation in Distributed Systems", Gul A. Agha , Cambridge Press, MA, 1986].
(1999-11-23)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Plenty of actors have found a way of capitalizing on their niche.
He built a stock company of actors and technicians, began overseeing his
  scripts, and eventually became a director.
Actors will put participants through a training session based on the actual
  manual used.
The people in the audience are actors and entertainers also, but they are
  looking at him with pride as they applaud.
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