Longman Dictionary of Contemporary English homepage

thereupon

 adverb
     
there‧up‧on formal
1 immediately after something else has happened, and usually as a result of it [= then]:
Thereupon the whole audience began cheering.
2SCL relating to a subject that has just been mentioned:
I read your article, and wish to comment thereupon.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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