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therein

[th air-in] /ˌðɛərˈɪn/
adverb
1.
in or into that place or thing.
2.
in that matter, circumstance, etc.
Origin of therein
1000
before 1000; Middle English therin, Old English thǣrin. See there, in
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for therein

therein

/ˌðɛərˈɪn/
adverb
1.
(formal) in or into that place, thing, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for therein
adv.

Old English þærin; see there + in.

Online Etymology Dictionary, © 2010 Douglas Harper
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10
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