1. Water falling from clouds to the earth's surface in the form of rain, snow, sleet, or hail
The precipitation forecast predicts heavy rain tomorrow.
A previsão de precipitação prevê chuva forte amanhã.
2. The act of falling or rushing headlong; a rapid or sudden action
His precipitação into the decision was a mistake.
Sua precipitação na decisão foi um erro.
3. In chemistry, the process of a substance separating from a solution to form a solid
The chemical reaction caused the precipitation of crystals.
A reação química causou a precipitação de cristais.