'actor' definitions:

Definition of 'actor'

From: WordNet
noun
A theatrical performer [syn: actor, histrion, player, thespian, role player]
noun
A person who acts and gets things done; "he's a principal actor in this affair"; "when you want something done get a doer"; "he's a miracle worker" [syn: actor, doer, worker]

Synonyms of 'actor'

From: Moby Thesaurus