Search Result for "reality principle":
Wordnet 3.0

NOUN (1)

1. (psychoanalysis) the governing principle of the ego; the principle that as a child grows it becomes aware of the real environment and the need to accommodate to it; 



WordNet (r) 3.0 (2006):

reality principle
    n 1: (psychoanalysis) the governing principle of the ego; the
         principle that as a child grows it becomes aware of the
         real environment and the need to accommodate to it [ant:
         pleasure principle, pleasure-pain principle, pleasure-
         unpleasure principle]