Search Result for "unipolar depression":
Wordnet 3.0

NOUN (1)

1. a major depressive episode that occurs without the manic phase that occurs in the classic form of bipolar disorder; 



WordNet (r) 3.0 (2006):

unipolar depression
    n 1: a major depressive episode that occurs without the manic
         phase that occurs in the classic form of bipolar disorder