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English definition of “rain”

rain

noun     /reɪn/
A1 [U] water that falls from the sky in small drops: heavy rain It looks like rain (= as if it will rain).Rain
the rains [plural] in tropical countries, the time of year when there is a lot of rain: They were waiting for the rains to come. → See also acid rainRain
(Definition of rain noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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