The Collaborative International Dictionary of English v.0.48:

Ledgment \Ledg"ment\ (-ment), n. (Arch.)
      (a) A string-course or horizontal suit of moldings, such
          as the base moldings of a building. --Oxf. Gloss.
      (b) The development of the surface of a body on a plane,
          so that the dimensions of the different sides may be
          easily ascertained. --Gwilt. [Written also
          ledgement, legement, and ligement.]
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ligement \Lige"ment\ (l[i^]j"ment), n.
   See Ledgment.
   [1913 Webster]