Definify.com
Webster 1913 Edition
Whereupon
Whereˊup-on′
,adv.
Upon which; in consequence of which; after which.
The townsmen mutinied and sent to Essex;
whereupon
he came thither. Clarendon.
Webster 1828 Edition
Whereupon
WHEREUPON
,adv.
The townsmen mutinied and sent to Essex, whereupon he came thither.