Etymology
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actor (n.)

late 14c., "an overseer, guardian, steward," from Latin actor "an agent or doer; a driver (of sheep, etc.)," in law, "accuser, plaintiff," also "theatrical player, orator," from past-participle stem of agere "to set in motion, drive, drive forward," hence "to do, perform," also "act on stage, play the part of; plead a cause at law" (from PIE root *ag- "to drive, draw out or forth, move"). In English from mid-15c. as "a doer, maker," also "a plaintiff at law." The sense of "one who performs in plays" is by 1580s, originally applied to both men and women. Related: Actorish; actorly; actory.

updated on September 14, 2022

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Definitions of actor from WordNet

actor (n.)
a theatrical performer;
Synonyms: histrion / player / thespian / role player
actor (n.)
a person who acts and gets things done;
he's a principal actor in this affair
Synonyms: doer / worker
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.