Definition of thereon adverb from the Oxford Advanced American Dictionary

 

thereon

 adverb
adverb
NAmE//ˌðɛrˈɑn//
 
, NAmE//ˌðɛrˈɔn//
 
(formal or law)
 
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on the thing mentioned a meeting to discuss the annual accounts and the auditors' report thereon
See the Oxford Advanced Learner's Dictionary entry: thereon