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whereupon

[hwair-uh-pon, -pawn, wair-; hwair-uh-pon, -pawn, wair-] /ˌʰwɛər əˈpɒn, -ˈpɔn, ˌwɛər-; ˈʰwɛər əˌpɒn, -ˌpɔn, ˈwɛər-/
conjunction
1.
upon what or upon which.
2.
at or after which.
3.
Archaic. upon what?
Origin of whereupon
1300-1350
1300-50; Middle English wherupon. See where, upon
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for whereupon

whereupon

/ˌwɛərəˈpɒn/
sentence connector
1.
at which; at which point; upon which
adverb
2.
(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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Word Origin and History for whereupon
conj.

c.1300, from where + upon.

Online Etymology Dictionary, © 2010 Douglas Harper
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