Definition of thereunder adverb from the Oxford Advanced Learner's Dictionary

 

thereunder

 adverb
adverb
BrE BrE//ˌðeərˈʌndə(r)//
 
; NAmE NAmE//ˌðerˈʌndər//
 
(law or formal)
 
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under the thing mentioned This savings plan is only available under the Finance Act 1990 and any regulations made thereunder.
See the Oxford Advanced American Dictionary entry: thereunder