on

prep. atop; as a part of; toward; from

adv. forth; ahead; while continuing

adj. activated; turned on

On. on, or ON may refer to:A switching state, contrasted with off"On", "being" in ancient GreekOntology, a branch of philosophy that deals with the concept of being (on)On, a transliteration of the Egyptian name of the city of HeliopolisOn, a priest in the Bible (Genesis 41:45), referring to "Poti-phera, priest of On" (where On may refer to Heliopolis or an Egyptian deity)On, a person mentioned in the Bible (Numbers 16:1)On, a Japanese word related to the English "syllable"; see Onji
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On Vox populi adverb Taking, receiving, as in, he/she is on coumadin, on drugs, etc [more]On - Community and Resources

Adjective
1. in operation or operational; "left the oven on"; "the switch is in the on position"
(antonym) off
(similar) connected
2. (of events) planned or scheduled; "the picnic is on, rain or shine"; "we have nothing on for Friday night"
(antonym) off, cancelled
(similar) happening
3. 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."
(synonym) on(p), on duty(p), on-duty(a)
(similar) active
Adverb
1. 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"
(synonym) along
2. indicates continuity or persistence or concentration; "his spirit lives on"; "shall I read on?"
3. in a state required for something to function or be effective; "turn the lights on"; "get a load on"

n. on, activated; turned on