1.the quantity of water falling to earth at a specific place within a specified period of time;
the storm brought several inches of precipitation
2.the process of forming a chemical precipitate
3.the falling to earth of any form of water (rain or snow or hail or sleet or mist)
4.the act of casting down or falling headlong from a height
5.an unexpected acceleration or hastening;
he is responsible for the precipitation of his own demise
6.overly eager speed (and possible carelessness);
he soon regretted his haste