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The Collaborative International Dictionary of English v.0.48:

Cavity \Cav"i*ty\, n.; pl. Cavities. [L. cavus hollow: cf. F. cavit['e].] 1. Hollowness. [Obs.] [1913 Webster] The cavity or hollowness of the place. --Goodwin. [1913 Webster] 2. A hollow place; a hollow; as, the abdominal cavity. [1913 Webster] An instrument with a small cavity, like a small spoon. --Arbuthnot. [1913 Webster] Abnormal spaces or excavations are frequently formed in the lungs, which are designated cavities or vomic[ae]. --Quain. [1913 Webster] Body cavity, the c[oe]lum. See under Body. [1913 Webster]