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precipitation (n.)

late 15c., "a casting down" (of the evil angels from heaven), also, in alchemy "separation of a solid substance from a solution," from Middle French precipitation (15c.) and directly from Latin praecipitationem (nominative praecipitatio) "act or fact of falling headlong, haste," noun of action from past participle stem of praecipitare "fall, be hasty," from praeceps (genitive praecipitis) "steep, headlong, headfirst," from prae "before, forth" (see pre-) + caput "head" (from PIE root *kaput- "head"). Meaning "sudden haste" is c. 1500. Meaning "act of falling from a height" is attested from 1610s. Meteorological sense of "rain, snow, dew, etc." is from 1670s.

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Definitions of precipitation from WordNet

precipitation (n.)
the quantity of water falling to earth at a specific place within a specified period of time;
the storm brought several inches of precipitation
precipitation (n.)
the process of forming a chemical precipitate;
precipitation (n.)
the falling to earth of any form of water (rain or snow or hail or sleet or mist);
Synonyms: downfall
precipitation (n.)
the act of casting down or falling headlong from a height;
precipitation (n.)
an unexpected acceleration or hastening;
he is responsible for the precipitation of his own demise
precipitation (n.)
overly eager speed (and possible carelessness);
Synonyms: haste / hastiness / hurry / hurriedness
From wordnet.princeton.edu