/ Dictionary / Index H HWM: Meaning and Definition of Find definitions for: HWM Pronunciation: [key] high-water mark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hwang Ho hwy Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language