Etymology
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precipitation (n.)

late 15c., precipitacioun, "a casting down" (of the evil angels from heaven), also, in alchemy "separation of a solid substance from a solution," from Old 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 "to throw or dive headlong; be hasty," from praeceps (genitive praecipitis) "steep, headlong, headfirst," from prae "before, forth" (see pre-) + caput "head" (from PIE root *kaput- "head").

The meaning "sudden haste" is from c. 1500. The meaning "act of falling from a height" is attested from 1610s. The meteorological sense of "rain, snow, dew, frost, hail, etc.; moisture from the atmosphere deposited on the earth's surface" is from 1670s.

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Definitions of precipitation

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