/prɪ,sɪpɪ'teɪʃn; prɪ,sɪpə`teʃən/
n
1 [U] (fml 文) violent haste 迅急; 匆促; 仓促; 鲁莽
*to act with precipitation 仓促行事.
2 [U] separation of a solid substance from the liquid in which it is held 沉淀; 淀析.
3 (a) [C] fall of rain, sleet, snow or hail （雨、雨夹雪、雪、雹子等的）降落
*a heavy precipitation 一场大雨（或雨夹雪、雪、雹子）.
(b) [U] amount of rain, etc thatfalls in an area 某地区降雨等的量
*the annual precipitationof the region 该地区的年降雨量.

n
[U]technical
rain, snow etc that falls on the ground, or the amount of rain, snow etc that falls
[U and C]technical
a chemical process in which a solid substance is separated from a liquid
[U]formal
the act of doing something too quickly in a way that is not sensible