The Collaborative International Dictionary of English v.0.48:

Sess \Sess\, v. t. [Aphetic form of assess. See Assess,
   Cess.]
   To lay a tax upon; to assess. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sess \Sess\, n.
   A tax; an assessment. See Cess. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

sess
    n 1: street names for marijuana [syn: pot, grass, green
         goddess, dope, weed, gage, sess, sens, smoke,
         skunk, locoweed, Mary Jane]