/ Dictionary / Index H HVAC: Meaning and Definition of Find definitions for: HVAC Pronunciation: [key] heating, ventilating, and air conditioning. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. H.V. HVDC Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language