acting /ˈæk.tɪŋ/noun 4adjective 1forms 1 noun4 •the work of performing as a character in films, on television or in the theater •Pretending. •Something done by a party—so called to avoid confusion with the legal senses of deed and action. •(no longer used) An action or deed.[…] he does so much magnifie Nature and her Actings in all this material World, as he gives just cause of suspicion that he hath made her a kind of joynt Deess with God in the Affairs thereof — 1685 adjective1 •Temporarily assuming the duties or authority of another person when they are unable to do their job.The Acting Minister must sign Executive Council documents in a Minister's absence.The CEO is currently in a hospital. The CFO is acting CEO in the meantime. formsactings