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thereinto

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

First recorded in 1250–1300, thereinto is from the Middle English word thar into. See there, into
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for thereinto

thereinto

adverb
  1. formal into that place, circumstance, 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