The Collaborative International Dictionary of English v.0.48:

jean \jean\ (j[=a]n), n. [Prob. named from Genoa. See Jane.]
   1. A twilled cotton cloth.
      [1913 Webster]

   2. (pl.) (j[=e]nz), Same as blue jeans.
      [PJC]

   3. (pl.) (j[=e]nz), Pants made of different fabrics,
      resembling blue jeans.
      [PJC]

   Satin jean, a kind of jean woven smooth and glossy, after
      the manner of satin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jean
    n 1: (usually plural) close-fitting trousers of heavy denim for
         manual work or casual wear [syn: jean, blue jean,
         denim]
    2: a coarse durable twill-weave cotton fabric [syn: denim,
       dungaree, jean]

The Free On-line Dictionary of Computing (30 December 2018):

JEAN

    A dialect of JOSS.

   [Details?]

   (1997-09-14)