Depression

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depression

  1. In general, a point or limited area of locally lower elevation in a particular surface.

  2. In meteorology, an area of low pressure; a low or trough.

    This is usually applied to a certain stage in the development of a tropical cyclone, to migratory lows and troughs, and to upper-level lows and troughs that are only weakly developed. This use of the term is most common in the European literature.
    See V-shaped depression.

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