precipitation
/prɪˌsɪpɪˈteɪʃən/noun
mass noun
1
- Chemistry the action or process of precipitating a substance from a solution【化】沉淀（反应）, 淀析（作用）; 沉降作用。
2
- rain, snow, sleet, or hail that falls to or condenses on the ground（雨、雪、雹等）降落; 降水。
3
- archaic the fact or quality of acting suddenly and rashly〈古〉贸然性; 轻率：
Cora was already regretting her precipitation.
科拉已经在为自己的轻率行为后悔了。
词源
late Middle English (denoting the action of falling or throwing down)： from Latin praecipitatio（n-）, from praecipitare 'throw down or headlong' （see PRECIPITATE）.