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whereupon

[hwair-uh-pon, -pawn, wair-; hwair-uh-pon, -pawn, wair-]
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conjunction
  1. upon what or upon which.
  2. at or after which.
  3. 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. 2018

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British Dictionary definitions for whereupon

whereupon

sentence connector
  1. at which; at which point; upon which
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adverb
  1. archaic upon what?
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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

Word Origin and History for whereupon

conj.

c.1300, from where + upon.

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Online Etymology Dictionary, © 2010 Douglas Harper