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English definition of “therein”

therein

adverb     /ˌðeəˈrɪn/ formal
in a particular document or place : We recommend that you study the report and the proposals contained therein.In and at
therein lies sth because of the reason that has just been given: But the medicines are expensive , and therein lies the problem .Motives and reasons
(Definition of therein adverb from the Cambridge Learner's Dictionary © Cambridge University Press)

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