Adjective on has 3 senses
  1. on - in operation or operational; "left the oven on"; "the switch is in the on position"
    Antonyms:
    off, disconnected
  2. on - (of events) planned or scheduled; "the picnic is on, rain or shine"; "we have nothing on for Friday night"
    Antonyms:
    off, cancelled
  3. on, on duty, on-duty - 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."
    Antonym: inactive (indirect, via active)
,Adverbial on has 3 senses
  1. along, on - 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"
  2. on - indicates continuity or persistence or concentration; "his spirit lives on"; "shall I read on?"
  3. on - in a state required for something to function or be effective; "turn the lights on"; "get a load on"
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