Precipitation n. Water that falls to the Earth's surface. Precipitation may refer to:
- Precipitation (meteorology), rain, sleet, hail, snow and other forms of water falling from the sky
- Precipitation (chemistry), the condensation of a solid from a solution during a chemical reaction
- Ammonium sulfate precipitation, a method of purifying proteins
- Basic precipitation, a type of precipitation characterized by high alkalinity
- Ethanol precipitation, a method of concentrating DNA
- Precipitation hardening, a method used to strengthen malleable materials
- Protein precipitation, a method of separating contaminants from biological products