/ Dictionary / Index S self-acting: Meaning and Definition of Find definitions for: self-act•ing Pronunciation: (self'ak'ting), [key] — adj. acting by itself; automatic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: self-acting (Thesaurus) self-abuse self-actualization Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language