Adjective
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(of events) planned or scheduled
"the picnic is on, rain or shine"
"we have nothing on for Friday night"
-
in operation or operational
"left the oven on"
"the switch is in the on position"
Adverb
-
in a state required for something to function or be effective
"turn the lights on"
"get a load on"
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indicates continuity or persistence or concentration
"his spirit lives on"
"shall I read 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"