say it: ahn
on is an adverb and adjective meaning "with a forward motion". It carries 5 recorded senses.
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”
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”
in operation or operational
“left the oven on”
“the switch is in the on position”
(of events) planned or scheduled
“the picnic is on, rain or shine”
“we have nothing on for Friday night”
Definitions, synonyms and semantic relations for on come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.