hyperventilate Syllabification: (hy·per·ven·ti·late)Pronunciation: /ˌhīpərˈventlˌāt/Translate hyperventilate | into French | into German | into Italian | into Spanish Definition of hyperventilate verb [no object] 1breathe or cause to breathe at an abnormally rapid rate, so increasing the rate of loss of carbon dioxide. 2 [with object] be or become overexcited:it was one less thing to hyperventilate about (as adjective hyperventilated) inflated or pretentious in style; overblown:hyperventilated proseDerivatives hyperventilationPronunciation: /-ˌventlˈāSHən/ noun hyperventilate in other Oxford dictionaries Definition of hyperventilate in the British & World English dictionary