noun (n)

• the quantity of water falling to earth at a specific place within a specified period of time(noun.quantity)

  Example:
  The storm brought several inches of precipitation.
  

  source: wordnet30
• the process of forming a chemical precipitate(noun.process)

  source: wordnet30
• the falling to earth of any form of water (rain or snow or hail or sleet or mist)(noun.phenomenon)

  Synonym:
  downfall
  

  source: wordnet30
• the act of casting down or falling headlong from a height(noun.event)

  source: wordnet30
• an unexpected acceleration or hastening(noun.attribute)

  Example:
  He is responsible for the precipitation of his own demise.
  

  source: wordnet30
• overly eager speed (and possible carelessness)(noun.attribute)

  Synonym:
  haste, hastiness, hurriedness, hurry
  

  source: wordnet30
• The act of precipitating, or the state of being precipitated, or thrown headlong.(noun)

  source: webster1913
• A deposit on the earth of hail, mist, rain, sleet, or snow; also, the quantity of water deposited.(noun)

  source: webster1913