Source : Webster's Revised Unabridged Dictionary (1913)

Olio \O"li*o\, n. [Sp. olla a round earthen pot, a dish of
   boiled or stewed meat, fr. L. olla a pot, dish. Cf. {Olla},
   {Olla-podrida}.]
   1. A dish of stewed meat of different kinds. [Obs.]

            Besides a good olio, the dishes were trifling.
                                                  --Evelyn.

   2. A mixture; a medley. --Dryden.

   3. (Mus.) A collection of miscellaneous pieces.