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The Collaborative International Dictionary of English v.0.48 (gcide)

Density \Den"si*ty\ (d[e^]n"s[i^]*t[y^]), n. [L. densitas; cf.
F. densit['e].]
1. The quality of being dense, close, or thick; compactness;
-- opposed to {rarity}.
[1913 Webster]

2. (Physics) The ratio of mass, or quantity of matter, to
bulk or volume, esp. as compared with the mass and volume
of a portion of some substance used as a standard.
[1913 Webster]

Note: For gases the standard substance is hydrogen, at a
temperature of 0[deg] Centigrade and a pressure of 760
millimeters. For liquids and solids the standard is
water at a temperature of 4[deg] Centigrade. The
density of solids and liquids is usually called
specific gravity, and the same is true of gases when
referred to air as a standard.
[1913 Webster]

3. (Photog.) Depth of shade. --Abney.
[1913 Webster]