THEREIN


Meaning of THEREIN in English

[adverb] [formal] - in or into a particular place, thing etc.(dated) Susan opened the box to find a key and a faded, dusty map therein.(figurative) Suzy's a socialist but her boyfriend votes Conservative - therein lies (= this is) the reason why they argue.

Cambridge English vocab.      Кембриджский английский словарь.