Open English Wordnet
Nouns
(n)precipitationthe quantity of water falling to earth at a specific place within a specified period of time“the storm brought several inches of precipitation”
(n)precipitation, downfallthe falling to earth of any form of water (rain or snow or hail or sleet or mist)
(n)precipitationan unexpected acceleration or hastening“he is responsible for the precipitation of his own demise”
(n)haste, hastiness, hurry, hurriedness, precipitationoverly eager speed (and possible carelessness)“he soon regretted his haste”