/ Dictionary / Index H hereupon: Meaning and Definition of Find definitions for: here•up•on Pronunciation: (hēr"u-pon', -pôn'), [key] — adv. upon or on this. immediately following this. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hereupon (Thesaurus) hereunder herewith Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language