/ Dictionary / Index S switch-on: Meaning and Definition of Find definitions for: switch-on Pronunciation: (swich'on", -ôn"), [key] — n. the act or process of switching on an ignition, light, appliance, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: switch-on (Thesaurus) switch-off switchover Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language