Look up precipitation or précipitation in Wiktionary, the free dictionary.

Precipitation is any meteorological phenomenon featuring water falling from the clouds, such as rain, snow, or hail.

Precipitation may also refer to:

• Alkaline precipitation, meteorological precipitation characterized by high alkalinity
• Precipitation (chemistry), condensation of a solid from a solution during a chemical reaction:
  • Ammonium sulfate precipitation, a method of purifying proteins
  • Precipitation hardening, a method used to strengthen malleable materials
  • Protein precipitation, a method of separating contaminants from biological products
    • For precipitation resulting from the denaturation of proteins, see coagulation
  • Ethanol precipitation, a method of concentrating DNA
• Precipitation (horse), a racehorse
• Electron precipitation, an atmospheric phenomenon that occurs when previously trapped electrons enter the Earth's atmosphere