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X: /X/ n. 1. Used in various speech and writing contexts (also
   in lowercase) in roughly its algebraic sense of `unknown within a
   set defined by context' (compare N).  Thus, the abbreviation
   680x0 stands for 68000, 68010, 68020, 68030, or 68040, and 80x86
   stands for 80186, 80286 80386 or 80486 (note that a UNIX hacker
   might write these as 680[0-4]0 and 80[1-4]86 or 680?0 and 80?86
   respectively; see glob).  2. [after the name of an earlier
   window system called `W'] An over-sized, over-featured,
   over-engineered and incredibly over-complicated window system
   developed at MIT and widely used on UNIX systems.