therefore, hence, thence, thus, so -- ((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")
hence -- (from this place; "get thee hence!")
hence -- (from this time; "a year hence it will be forgotten")