Definition of hereupon adverb from the Oxford Advanced American Dictionary

 

hereupon

 adverb
adverb
NAmE//ˌhɪrəˈpɑn//
 
, NAmE//ˌhɪrəˈpɔn//
 
(literary)
 
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after this; as a direct result of this situation
See the Oxford Advanced Learner's Dictionary entry: hereupon