flat

flat adj.  1. Lacking any complex internal structure.
   "That {bitty box} has only a flat filesystem, not a
   hierarchical one."  The verb form is {flatten}.  2. Said of a
   memory architecture (like that of the VAX or 680x0) that is one big
   linear address space (typically with each possible value of a
   processor register corresponding to a unique core address), as
   opposed to a `segmented' architecture (like that of the 80x86) in
   which addresses are composed from a base-register/offset pair
   (segmented designs are generally considered {cretinous}).
  
   Note that sense 1 (at least with respect to filesystems) is usually
   used pejoratively, while sense 2 is a {Good Thing}.