The Collaborative International Dictionary of English v.0.48:
Soken \Sok"en\, n. [Cf. Socome.]
   1. A toll. See Soc, n., 2. [Obs.]
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            Great sooken had this miller, out of doubt.
                                                  --Chaucer.
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   2. A district held by socage.
      [1913 Webster]