/ Dictionary / Index H hypervelocity: Meaning and Definition of Find definitions for: hy•per•ve•loc•i•ty Pronunciation: (hī"pur-vu-los'i-tē), [key] — pl. -ties. extremely high velocity, as of projectiles, space vehicles, or accelerated nuclear particles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypervelocity (Thesaurus) hyperuricemia hyperventilate Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language