Source : Webster's Revised Unabridged Dictionary (1913)

On \On\, adv. [See {On}, prep.]
   1. Forward, in progression; onward; -- usually with a verb of
      motion; as, move on; go on. ``Time glides on.''
      --Macaulay.

            The path is smooth that leadeth on to danger.
                                                  --Shak.

   2. Forward, in succession; as, from father to son, from the
      son to the grandson, and so on.

   3. In continuance; without interruption or ceasing; as, sleep
      on, take your ease; say on; sing on.

   4. Adhering; not off; as in the phrase, ``He is neither on
      nor off,'' that is, he is not steady, he is irresolute.

   5. Attached to the body, as clothing or ornament, or for use.
      ``I have boots on.'' --B. Gonson.

            He put on righteousness as a breastplate. --Is. lix.
                                                  17.

   6. In progress; proceeding; as, a game is on.

   Note: On is sometimes used as an exclamation, or a command to
         move or proceed, some verb being understood; as, on,
         comrades; that is, go on, move on.

   {On and on}, continuously; for a long time together.
      ``Toiling on and on and on.'' --Longfellow.