Definitions of thence:

• adverb:   from that place or from there

  Example: "Proceeded thence directly to college"

• adverb:   from that circumstance or source

  Example: "Atomic formulas and all compounds thence constructible- W.V.Quine"

• adverb:   (used to introduce a logical conclusion) from that fact or reason or as a result

  Example: "We were young and thence optimistic"