Webster's English Dictionary

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precipitation

pre.cip.i.ta.tion \pri-.sip-*-'ta--sh*n\ n 1: the quality or state of being 
   precipitate : HASTE  2: an act, process, or instance of precipitating; esp 
   : the process  of forming a precipitate 3: something precipitated : as  3a: 
   a deposit on the earth of hail, mist, rain, sleet, or snow; also  : the 
   quantity of water deposited 3b: PRECIPITATE