The Collaborative International Dictionary of English v.0.48:

Jointing \Joint"ing\, n.
   The act or process of making a joint; also, the joints thus
   produced.
   [1913 Webster]

   Jointing machine, a planing machine for wood used in
      furniture and piano factories, etc.

   Jointing plane. See Jointer, 2.

   Jointing rule (Masonry), a long straight rule, used by
      bricklayers for securing straight joints and faces.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jointing plane
    n 1: a long carpenter's plane used to shape the edges of boards
         so they will fit together [syn: jointer, jointer plane,
         jointing plane, long plane]