/ Dictionary / Index H HBO: Meaning and Definition of Find definitions for: HBO Pronunciation: [key] Home Box Office (a cable television channel). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. H.B.M. H-bomb Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language