Definition of La Niña noun from the Oxford Advanced Learner's Dictionary

 

La Niña

 noun
noun
BrE BrE//lɑː ˈniːnjə//
 
; NAmE NAmE//lɑː ˈniːnjə//
 
[uncountable]
 
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the cooling of the water in the central and eastern Pacific Ocean that happens every few years and that affects the weather in many parts of the world compare El Niño (1)
See the Oxford Advanced American Dictionary entry: La Niña