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.