thence in WordNet English dictionary

1. (used to introduce a logical conclusion) from that fact or reason or as a result
   "therefore X must be true"; "the eggs were fresh and hence satisfactory"; "we were young and thence optimistic"; "it is late and thus we must go"; "the witness is biased and so cannot be trusted"
   therefore  hence  thence  thus  so  therefore  hence  thence  thus  so 
   
2. from that place or from there
   "proceeded thence directly to college"; "flew to Helsinki and thence to Moscow"; "roads that lead therefrom"
   thence  therefrom  thence  therefrom 
   
3. from that circumstance or source
   "atomic formulas and all compounds thence constructible"- W.V.Quine; "a natural conclusion follows thence"; "public interest and a policy deriving therefrom"; "typhus fever results therefrom"
   thence  therefrom  thereof  thence  therefrom  thereof