Etymology
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herein (adv.)

late Old English herinne "in this;" see here + in. Related: Hereinafter.

updated on July 04, 2015

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Definitions of herein from WordNet

herein (adv.)
in this place or thing or document;
I shall discuss the question herein
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.