hence 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 this time
   "a year hence it will be forgotten"
   hence  hence 
   
3. from this place
   "get thee hence!"
   hence  hence