American English

Definition of precipitation noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable] (technology) 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
  2. 2[uncountable, countable] (chemistry) a chemical process in which solid material is separated from a liquid calcium phosphate precipitation
See the Oxford Advanced Learner's Dictionary entry: precipitation