Meaning : In operation or operational.
Left the oven on.
The switch is in the on position.
Meaning : (of events) planned or scheduled.
The picnic is on, rain or shine.
We have nothing on for Friday night.
Meaning : 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.
Synonyms : along
Meaning : Indicates continuity or persistence or concentration.
His spirit lives on.
Shall I read on?.
Meaning : In a state required for something to function or be effective.
Turn the lights on.
Get a load on.