Definition of substitution. 1  1a : the act, process, or result of substituting one thing for anotherb : replacement of one mathematical entity by another of equal value. 2  2 : one that is substituted for another.
Homogenized milk is any sort of milk that has been mechanically treated to ensure that it has a smooth, even consistency. The homogenization process typically involves high temperatures, agitation, and filtration, all aimed at breaking down milk's naturally occurring fat molecules.
Evaporated milk. A type of milk that is unpasteurized whole milk condensed by evaporating 50 to 60 percent of the water content in the milk. Unlike condensed milk which begins with pasteurized milk and is not heat processed, evaporated milk is sterilized through heat treatment and a vacuum process, making it more concentrated than whole milk.