n. overly eager speed (and possible carelessness); "he soon regretted his haste"

n. an unexpected acceleration or hastening; "he is responsible for the precipitation of his own demise"

n. the falling to earth of any form of water (rain or snow or hail or sleet or mist)

n. the process of forming a chemical precipitate

n. [the falling of rain, snow etc. on the earth's surface]