/ Dictionary / Index S single-action: Meaning and Definition of Find definitions for: sin•gle-ac•tion Pronunciation: (sing'gul-ak'shun), [key] — adj. (of a firearm) requiring the cocking of the hammer before firing each shot: a single-action revolver. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. single-acting single-barrel Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language