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

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

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World English Dictionary
whereupon (ˌwɛərəˈpɒn)
sentence connector
1.  at which; at which point; upon which
2.  archaic upon what?

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
However, he managed to tip the chair over whereupon all the defendants got up
  and started fighting with the marshals.
The sockets remain dormant until the appointed hour, whereupon the juice flows
  into any gadget of your choosing.
Anna can be seen walking down the catwalk whereupon she accidentally drops a
  pistol on the floor.
Vitamins were discovered, whereupon vitamin-deficiency psychiatric disorders no
  longer were treated by psychiatrists.
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