Depression

Depression may refer to:

Mental health

 * Depression (mood), a state of low mood and aversion to activity
 * Mood disorders characterized by depression are commonly referred to as simply depression, including:
 * Bipolar disorder, also known as manic depression
 * Dysthymia, also known as persistent depressive disorder
 * Major depressive disorder, also known as clinical depression

Economics

 * Economic depression, a sustained, long-term downturn in economic activity in one or more economies
 * Great Depression, a severe economic depression during the 1930s, commonly referred to as simply the Depression
 * Long Depression, an economic depression during 1873–96, known at the time as the Great Depression

Biology

 * Depression (kinesiology), an anatomical term of motion, refers to downward movement, the opposite of elevation
 * Depression (physiology), a reduction in a biological variable or the function of an organ
 * Central nervous system depression, physiological depression of the central nervous system that can result in loss of consciousness

Earth science

 * Depression (geology), a landform sunken or depressed below the surrounding area
 * Depression (weather), an area of low atmospheric pressure characterized by rain and unstable weather