The Collaborative International Dictionary of English v.0.48:

High \High\, n.
   1. An elevated place; a superior region; a height; the sky;
      heaven.
      [1913 Webster]

   2. People of rank or high station; as, high and low.
      [1913 Webster]

   3. (Card Playing) The highest card dealt or drawn.
      [1913 Webster]

   High, low, jack, and the game, a game at cards; -- also
      called all fours, old sledge, and seven up.

   In high and low, utterly; completely; in every respect.
      [Obs.] --Chaucer.

   On high, aloft; above.
      [1913 Webster]

            The dayspring from on high hath visited us. --Luke
                                                  i. 78.

   The Most High, the Supreme Being; God.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "on high":
   above, abovestairs, airward, aloft, aloof, among the blest,
   ethereally, high, high up, in glory, in heaven, in the air,
   in the clouds, on stilts, on the peak, on tiptoe, over, overhead,
   paradisally, skyward, straight up, tiptoe, to the zenith, up,
   upstairs, upward, upwards