Source : Webster's Revised Unabridged Dictionary (1913)

Detail \De*tail"\, n. (Arch. & Mach.)
   (a) A minor part, as, in a building, the cornice, caps of the
       buttresses, capitals of the columns, etc., or (called
       {larger details}) a porch, a gable with its windows, a
       pavilion, or an attached tower.
   (b) A detail drawing.

   {In detail}, in subdivisions; part by part; item by item;
      circumstantially; with particularity.