American English

Definition of therein adverb from the Oxford Advanced American Dictionary

 

therein

 adverb
adverb
NAmE//ˌðɛrˈɪn//
 
(formal or law)
 
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  • in the place, object, document, etc. mentioned The insurance policy covers the building and any fixtures contained therein. In court she denied any knowledge of the article and the allegations made therein.
  • Idioms
    therein lies…
     
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    used to emphasize the result or consequence of a particular situation He works extremely hard and therein lies the key to his success.
    See the Oxford Advanced Learner's Dictionary entry: therein