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whereupon

[ hwair-uh-pon, -pawn, wair-; hwair-uh-pon, -pawn, wair- ]
/ ˌʰwɛər əˈpɒn, -ˈpɔn, ˌwɛər-; ˈʰwɛər əˌpɒn, -ˌpɔn, ˈwɛər- /
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conjunction
upon what or upon which.
at or after which.
Archaic. upon what?
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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. 2022

How to use whereupon in a sentence

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
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