/ Dictionary / Index H hl: Meaning and Definition of Find definitions for: hl Pronunciation: [key] hectoliter; hectoliters. H.L. Pronunciation: [key] House of Lords. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hl (Thesaurus) HK HLA Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language