Source: Sigmund Freud photo, Public Domain: http://en.wikipedia.org/wiki/File:Sigmund_Freud_LIFE.jpg
The idea that all of our ways of thinking, feeling, and behaving are learned behaviors rather than preprogrammed biological propensities.
Freud argued that personality consisted of three elements: 1) Id - our basic biological impulses; 2) Superego - the internalized cultural norms of society; 3) Ego - the element that balances the id and the superego.
An individual's stable behavioral characteristics such as their ingrained ways of thinking, feeling, and acting.
The lifelong process of learning one's culture and of internalizing the norms and behaviors considered appropriate of adults in society.