WordReference Random House Learner's Dictionary of American English © 2015
here•in /hɪrˈɪn/USA pronunciation adv. 

    in or into this place, situation, circumstance, etc.:all the words contained herein.

Collins Concise English Dictionary © HarperCollins Publishers::

herein /ˌhɪərˈɪn/ adv
  1. formal in or into this place, thing, document, etc
  2. rare in this respect, circumstance, etc

'herein' also found in these entries:

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