whereupon

[ hwair-uh-pon, -pawn, wair-; hwair-uh-pon, -pawn, wair- ]
/ ˌʰwɛər əˈpɒn, -ˈpɔn, ˌwɛər-; ˈʰwɛər əˌpɒn, -ˌpɔn, ˈwɛər- /

conjunction

upon what or upon which.
at or after which.
Archaic. upon what?

Origin of whereupon

First recorded in 1300–50, whereupon is from the Middle English word wherupon. See where, upon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for whereupon

British Dictionary definitions for whereupon

whereupon

/ (ˌwɛərəˈpɒn) /

sentence connector

at which; at which point; upon which

adverb

archaic upon what?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012