1. The action of making feminine.
2. The giving of a feminine inflexion to a word.
3. The process by which a condition or activity becomes especially or increasingly associated with women; as in the phrase, feminization of poverty. Originally and chiefly a U.S. term.
4. In bioloby, the assumption of female sexual characteristics (by a male animal or plant); the occurrence of female sexual characteristics in a person who is genetically male.