The Collaborative International Dictionary of English v.0.48:

Working \Work"ing\,
   a & n. from Work.
   [1913 Webster]

         The word must cousin be to the working.  --Chaucer.
   [1913 Webster]

   Working beam. See Beam, n. 10.

   Working class, the class of people who are engaged in
      manual labor, or are dependent upon it for support;
      laborers; operatives; -- chiefly used in the plural.

   Working day. See under Day, n.

   Working drawing, a drawing, as of the whole or part of a
      structure, machine, etc., made to a scale, and intended to
      be followed by the workmen. Working drawings are either
      general or detail drawings.

   Working house, a house where work is performed; a
      workhouse.

   Working point (Mach.), that part of a machine at which the
      effect required; the point where the useful work is done.
      [1913 Webster]