Definitions of hence:

• adverb:   from this time

  Example: "A year hence it will be forgotten"

• adverb:   from this place

  Example: "Get thee hence!"

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

  Example: "The eggs were fresh and hence satisfactory"

• name:  A surname (very rare: popularity rank in the U.S.: #30282)