Source : Webster's Revised Unabridged Dictionary (1913)

Cavity \Cav"i*ty\, n.; pl. {Cavities}. [L. cavus hollow: cf. F.
   cavit['e].]
   1. Hollowness. [Obs.]

            The cavity or hollowness of the place. --Goodwin.

   2. A hollow place; a hollow; as, the abdominal cavity.

            An instrument with a small cavity, like a small
            spoon.                                --Arbuthnot.

            Abnormal spaces or excavations are frequently formed
            in the lungs, which are designated cavities or
            vomic[ae].                            --Quain.

   {Body cavity}, the c[oe]lum. See under {Body}.