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Noun[edit] cavity â(plural cavities) 1  A hole or hollow depression. 2  A hollow area within the body (such as the sinuses). ( dentistry) A soft area in a decayed tooth.
hole. 1  an opening through something; gap; aperture: a hole in the roof; a hole in my sock. 2  a hollow place in a solid body or mass; a cavity: a hole in the ground. 3  the excavated habitation of an animal; burrow. 4  a small, dingy, or shabby place: I couldn't live in a hole like that. 5  a place of solitary confinement; dungeon.