= F =
1. [common] 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.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.