precipitation in WordNet English dictionary

1. the falling to earth of any form of water (rain or snow or hail or sleet or mist)
   precipitation  downfall 
   
2. overly eager speed (and possible carelessness)
   "he soon regretted his haste"
   haste  hastiness  hurry  hurriedness  precipitation 
   
3. an unexpected acceleration or hastening
   "he is responsible for the precipitation of his own demise"
   precipitation 
   
4. the act of casting down or falling headlong from a height
   precipitation 
   
5. the process of forming a chemical precipitate
   precipitation 
   
6. 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