The Collaborative International Dictionary of English v.0.48:

Syne \Syne\, adv. [See Since.]
   1. Afterwards; since; ago. [Obs. or Scot.] --R. of Brunne.
      [1913 Webster]

   2. Late, -- as opposed to soon.
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            [Each rogue] shall be discovered either soon or
            syne.                                 --W. Hamilton
                                                  (Life of
                                                  Wallace).
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Syne \Syne\, conj.
   Since; seeing. [Scot.]
   [1913 Webster]