The terms depression and depress(ed) may refer to: Psychology Major depressive disorder (also known as clinical depression or major depression), a specific diagnosis from the Diagnostic and Statistical Manual of Mental Disorders by the American Psychiatric Association Major depressive episode Atypical depression, a cyclical sub-type of major depression where sleep, feeding and perception of pleasure are normal but there's a feeling of lethargy Melancholic depression a sub-type of major dep… (More on Depression)