Definition: When discussing human development, individuation refers to the process of forming a stable personality. As a person individuates, he gains a clearer sense of self that is separate from parents and others around him.
Individuation is a process that occurs throughout life, but is an important part of the tween, teen and young adulthood years.Adolescent egocentrism may arise due to the individuation process.
Carl Jung used the term "individuation" extensively in his work on personality development.
Source:
Rathus, PhD, Spencer. Psychology: Concepts and Connections, Brief Version. 8th edition. 2007. Belmont, CA: Thomson, Wadsworth.