Word Source - www.word.sc/on - Dictionary definition for on

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adjective

in operation or operational; "left the oven on"; "the switch is in the on position"
Antonyms: off Similar: connected
(of events) planned or scheduled; "the picnic is on, rain or shine"; "we have nothing on for Friday night"
Antonyms: off, cancelled Similar: happening
performing or scheduled for duties; "I''m on from five to midnight"; "Naval personnel on duty in Alaska"; "her on-duty hours were 11p.m. to 7 a.m."
Synonyms: on-duty, on duty Similar: active

adverb

with a forward motion; "we drove along admiring the view"; "the horse trotted along at a steady pace"; "the circus traveled on to the next city"; "move along"; "march on"
Synonyms: along
indicates continuity or persistence or concentration; "his spirit lives on"; "shall I read on?"
in a state required for something to function or be effective; "turn the lights on"; "get a load on"