Minor depressive disorder, also known as minor depression, is a mood disorder that does not meet full criteria for major depressive disorder but in which at least two depressive symptoms are present for two weeks.Rapaport MH, Judd LL, Schettler PJ, Yonkers KA, Thase ME, Kupfer DJ, Frank E, Plewes JM, Tollefson GD, Rush AJ.