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therein

[th air-in]
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adverb
  1. in or into that place or thing.
  2. in that matter, circumstance, etc.
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Origin of therein

before 1000; Middle English therin, Old English thǣrin. See there, in
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

inside, internally, inward, there

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British Dictionary definitions for therein

therein

adverb
  1. formal in or into that place, thing, etc
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for therein

adv.

Old English þærin; see there + in.

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Online Etymology Dictionary, © 2010 Douglas Harper