/ Dictionary / Index H H.H.: Meaning and Definition of Find definitions for: H.H. Pronunciation: [key] His Highness; Her Highness. His Holiness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hgwy. hhd Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language