Source : Webster's Revised Unabridged Dictionary (1913)

--Tennyson.

      It still wore the majesty of expression so conspicuous in
      his portraits by the inimitable pencil of Titian.
                                                  --Prescott.

   5. A form of words in which an idea or sentiment is conveyed;
      a mode of speech; a phrase; as, a common expression; an
      odd expression.

   6. (Math.) The representation of any quantity by its
      appropriate characters or signs.

   {Past expression}, {Beyond expression}, beyond the power of
      description. ``Beyond expression bright.'' --Milton.