Wordnet 3.0
NOUN (1)
1.
(psychiatry) a defense mechanism in which a person unconsciously develops attitudes and behavior that are the opposite of unacceptable repressed desires and impulses and serve to conceal them;
- Example: "his strict morality is just a reaction formation to hide his sexual drive"
WordNet (r) 3.0 (2006):
reaction formation
n 1: (psychiatry) a defense mechanism in which a person
unconsciously develops attitudes and behavior that are the
opposite of unacceptable repressed desires and impulses and
serve to conceal them; "his strict morality is just a
reaction formation to hide his sexual drive"