What is the meaning of Depression?

A state of mind producing serious, long-term lowering of enjoyment of life or inability to visualize a happy future.

A period of low morale or unhappiness (a period of experiencing the above-mentioned state of mind) which lasts longer than several weeks and may include ideation of self-inflicted injury or suicide.

An area that is lower in topography than its surroundings.

An area of lowered air pressure that generally brings moist weather, sometimes promoting hurricanes and tornadoes.

A period of major economic contraction.

Four consecutive quarters of negative, real GDP growth. See NBER.

The act of lowering or pressing something down.

A lowering, in particular a reduction in a particular biological variable or the function of an organ, in contrast to elevation.

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genitive singular of depressio

depression (all meanings).

Source: wiktionary.org