1. (psychoanalysis) the governing principle of the id; the principle that an infant seeks gratification and fails to distinguish fantasy from reality
   - pleasure principle, pleasure-unpleasure principle

Type of: principle

• undreamt of
• undress
• undressed
• undried
• undrinkable
• Undset
• undue
• undulant
• undulant fever
• undulate
• undulation
• undulatory
• undulatory theory
• unduly
• undutiful
• undutifulness
• undyed
• undying
• undynamic
• uneager
• unearned
• unearned income
• unearned increment
• unearned revenue
• unearned run