precipitation

Concise Oxford English Dictionary © 2008 Oxford University Press:
precipitation/prɪsɪpɪˈteɪʃn/

▶noun

• 1 Chemistry the action or process of precipitating a substance from a solution.

• 2 rain, snow, sleet, or hail that falls to or condenses on the ground.

• 3 archaic the fact or quality of acting precipitately.