on

adjectives

in operation or operational
"left the oven on"; "the switch is in the on position"
on
antonym
off
is similar to
plugged in
"first check to see whether the appliance is connected"
connected
(of events) planned or scheduled
"the picnic is on, rain or shine"; "we have nothing on for Friday night"
on
antonym
off

adverbs

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"
along, on
indicates continuity or persistence or concentration
"his spirit lives on"; "shall I read on?"
on
in a state required for something to function or be effective
"turn the lights on"; "get a load on"
on