Definition of rainfall noun from the Oxford Advanced American Dictionary

 

rainfall

 noun
noun
NAmE//ˈreɪnfɔl//
 
[uncountable, singular]
 
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the total amount of rain that falls in a particular area in a particular amount of time; an occasion when rain falls There has been below average rainfall this month. an average annual rainfall of 10  in.
See the Oxford Advanced Learner's Dictionary entry: rainfall