Precipitation is rain, snow, sleet, or hail — any kind of weather condition where something's falling from the sky.

Precipitation has to do with things falling down, and not just from the sky. It's also what happens in chemical reactions when a solid settles to the bottom of a solution. If you have hard water where you live, you might find lime deposits — a flaky white crust — on your faucets and showerhead. That's caused by precipitation of the minerals in the water. The minerals settle out — they precipitate — and clog the pipes.

Definitions of precipitation
  1. noun
    the falling to earth of any form of water (rain or snow or hail or sleet or mist)
    synonyms: downfall
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    fine spray
    precipitation in very small drops
    precipitation of ice pellets when there are strong rising air currents
    rain, rainfall
    water falling in drops from vapor condensed in the atmosphere
    partially melted snow (or a mixture of rain and snow)
    snow, snowfall
    precipitation falling from clouds in the form of ice crystals
    light wispy precipitation that evaporates before it reaches the ground (especially when the lower air is low in humidity)
    a storm with rain
    cloudburst, deluge, downpour, pelter, soaker, torrent, waterspout
    a heavy rain
    drizzle, mizzle
    very light rain; stronger than mist but less than a shower
    rain shower, shower
    a brief period of precipitation
    flurry, snow flurry
    a light brief snowfall and gust of wind (or something resembling that)
    an arctic atmospheric condition with clouds over snow produce a uniform whiteness and objects are difficult to see; occurs when the light reflected off the snow equals the light coming through the clouds
    heavy rains accompanied by wind, typical of the rainy season in southern Asia
    type of:
    atmospheric condition, conditions, weather, weather condition
    the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation
  2. noun
    the quantity of water falling to earth at a specific place within a specified period of time
    “the storm brought several inches of precipitation
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    type of:
    indefinite quantity
    an estimated quantity
  3. noun
    the act of casting down or falling headlong from a height
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    type of:
    drop, fall
    a free and rapid descent by the force of gravity
  4. noun
    an unexpected acceleration or hastening
    “he is responsible for the precipitation of his own demise”
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    type of:
    an increase in rate of change
  5. noun
    overly eager speed (and possible carelessness)
    synonyms: haste, hastiness, hurriedness, hurry
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    abruptness, precipitance, precipitancy, precipitateness, precipitousness, suddenness
    the quality of happening with headlong haste or without warning
    type of:
    fastness, speed, swiftness
    a rate (usually rapid) at which something happens
  6. noun
    the process of forming a chemical precipitate
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    type of:
    chemical action, chemical change, chemical process
    (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
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