/ Dictionary / Index H hyperventilate: Meaning and Definition of Find definitions for: hy•per•ven•ti•late Pronunciation: (hī"pur-ven'tl-āt"), [key] — v., -lat•ed, -lat•ing. —v.i. to be afflicted with hyperventilation; breathe abnormally fast and deep. —v.t. to cause (a patient) to breathe more rapidly and deeply than normal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hyperventilate (Thesaurus) hypervelocity hyperventilation Related Content Daily Word Quiz: abyss Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language