precipitation

the quantity of water falling to earth at a specific place within a specified period of time; "the storm brought several inches of precipitation"

the process of forming a chemical precipitate

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

the act of casting down or falling headlong from a height

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

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