Definition of hyperventilation noun from the Oxford Advanced Learner's Dictionary

 

hyperventilation

 noun
noun
BrE BrE//ˌhaɪpəˌventɪˈleɪʃn//
 
; NAmE NAmE//ˌhaɪpərˌventɪˈleɪʃn//
 
[uncountable](specialist)
 
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a condition in which you breathe too quickly because you are very frightened or excited The symptoms of hyperventilation can mimic all the symptoms of anxiety and chronic stress.