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Libido (libē'dō, –bī'–) [key][Lat.,=lust]

Psychoanalytic term used by Sigmund Freud to identify instinctive energy with the sex instinct. For Freud, libido is the generalized sexual energy of which conscious activity is the expression. C. G. Jung used the term synonymously with instinctive energy in general. Many psychiatrists now feel that Freud overemphasized the concept of libido as the determinant of personality development and did not adequately emphasize the results of socializing forces. The term drive is often used instead of libido but without the sexual implications of the latter. See psychoanalysis.

http://www.infoplease.com/ce6/sci/A0829679.html

Super ego

Acts as the conscience, maintaining our sense of morality and the prohibition of taboos. Its formation takes place during the dissolution of the Oedipus complex and is formed by an identification with and internalization of the father figure after the little boy cannot successfully hold the mother as a love-object out of fear of castration. "The super-ego retains the character of the father, while the more powerful the Oedipus complex was and the more rapidly it succumbed to repression (under the influence of authority, religious teaching, schooling and reading), the stricter will be the domination of the super-ego over the ego later on — in the form of conscience or perhaps of an unconscious sense of guilt" (The Ego and the Id, 1923).Sigmund Freud also discusses the concept of a "cultural super-ego". The concept of super ego and the Oedipus complex is subject to criticism for its sexism. Women, who are considered to be already castrated, do not identify with the father, and therefore form a weak superego, apparently leaving them susceptible to immorality and sexual identity complications.
(from wikipedia)

re·pres·sion (rĭ-prĕsh'ən)
n.
1. The act of repressing or the state of being repressed.
2. Psychology. The unconscious exclusion of painful impulses, desires, or fears from the conscious mind.
http://www.answers.com/topic/repression

Id (ĭd)
n.
In Freudian theory, the division of the psyche that is totally unconscious and serves as the source of instinctual impulses and demands for immediate satisfaction of primitive needs.

[New Latin (translation of German Es, a special use of es, it, as a psychoanalytic term), from Latin, it.]