Definition of actor

< actomyosin

actress >

ac·tor    (ktr) KEY 

NOUN:

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

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ETYMOLOGY:
Middle English actour, doer, probably from Latin ctor, from ctus, past participle of agere, to drive, do; see ag- in Indo-European roots