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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.
from The American HeritageÂ® Dictionary of the English Language, 4th Edition. adj. Having a cavity, gap, or space within: a hollow wall. adj. Deeply indented or concave; sunken: His bearded face already has a set, hollow lookâ ( Conor Cruise O'Brien). adj. Without substance or character: a hollow person.