precipitation noun definition in Rain topic from the Oxford Advanced Learner's Dictionary

precipitation

 noun: Rain topic
[uncountable] (specialist) rain, snow, etc. that falls; the amount of this that falls There is heavy precipitation in some parts of the country. Acid precipitation may cause a reduction in forest productivity. an increase in annual precipitation Annual precipitation ranges from 500 to 2 200 mm. In these areas precipitation was formerly too low to support growth.