where·up·on

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

Origin:
1300–50; Middle English wherupon. See where, upon

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World English Dictionary
whereupon (ˌwɛərəˈpɒn) [Click for IPA pronunciation guide]
 
sentence connector
1.  at which; at which point; upon which
 
adv
2.  archaic upon what?

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Whereupon is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
Whereupon somebody else launched a sanguinary martyrdom, which called for color.
He leaves the room, whereupon the boss pulls open a desk drawer and lifts a
  bottle to his lips.
He began the night introduced in a shroud of artificial smoke, whereupon he was
  promptly drowned in waves of genuine applause.
Whereupon they concluded for the future to hold his interrogatories in the
  night.
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Synonyms
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