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.
Email. Print. The process used by food manufacturers and processors to prevent or detain fat, such as the cream in fresh milk, from separating away from the liquid or water contained in a dairy product. In years past, it was common to see bottled milk that has not been Homogenized.