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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).