What is Adulteration?

Legal Definition
This term denotes the act of mixing something impure with something pure, as, to mix an inferior liquor with wino; au inferior article with coffee, tea,.and the like.
-- Bouviers Law Dictionary
Legal Definition
The act of corrupting or debasing. The term is generally applied to the act of mixing up with food or drink intended to be sold other matters of an inferior quality, and usually of a more or less deleterious quality. Grosvenor v. Duffy, 121 Mich. 220, 80 N. W. 19; Com. v. Hufnal, 185 Pa. 376, 39 Atl. 1052; People v. West, 44 Hun (N. Y.) 162.
-- Black's Law Dictionary