• adjective:   in operation or operational

  Example: "Left the oven on"

• adjective:   (of events) planned or scheduled

  Example: "The picnic is on, rain or shine"

• adverb:   indicates continuity or persistence or concentration

  Example: "His spirit lives on"

• adverb:   in a state required for something to function or be effective

  Example: "Turn the lights on"

• adverb:   with a forward motion

  Example: "We drove along admiring the view"

• name:  A surname (very rare: popularity rank in the U.S.: #28542)

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