Wordnet 3.0
NOUN (1)
1.
(psychiatry) a state of depression with all the classic symptoms (anhedonia and lethargy and sleep disturbance and despondency and morbid thoughts and feelings of worthlessness and sometimes attempted suicide) but with no known organic dysfunction;
WordNet (r) 3.0 (2006):
major depressive episode
n 1: (psychiatry) a state of depression with all the classic
symptoms (anhedonia and lethargy and sleep disturbance and
despondency and morbid thoughts and feelings of
worthlessness and sometimes attempted suicide) but with no
known organic dysfunction