/ Dictionary / Index W whereupon: Meaning and Definition of Find definitions for: where•up•on Pronunciation: (hwâr"u-pon', -pôn', wâr"--hwâr'u-pon", -pôn", wâr'-), [key] — conj. upon what or upon which. at or after which. upon what? Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. whereunto where've Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language