WordReference Random House Unabridged Dictionary of American English © 2015
there•to  (ᵺâr′to̅o̅), 
  1. to that place, thing, etc.
  2. to that matter, circumstance, etc.
Also,there•un•to (ᵺâr′un to̅o̅, ᵺâr′unto̅o̅). 
  • Middle English therto, Old English thǣrtō. See there, to bef. 900

Collins Concise English Dictionary © HarperCollins Publishers::

thereto /ˌðɛəˈtuː/ adv
  1. formal to that or it
  2. obsolete in addition to that

'thereto' also found in these entries:

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