Definitions of precipitation:

• noun:   an unexpected acceleration or hastening

  Example: "He is responsible for the precipitation of his own demise"

• noun:   the act of casting down or falling headlong from a height
• noun:   the falling to earth of any form of water (rain or snow or hail or sleet or mist)
• noun:   the process of forming a chemical precipitate
• noun:   the quantity of water falling to earth at a specific place within a specified period of time

  Example: "The storm brought several inches of precipitation"

• noun:   overly eager speed (and possible carelessness)