Module

     (modular programming) Generically, a procedure or function (or a set of
     related procedures and functions) that can be treated as a unit.
     Sometimes used to refer specifically to the code in a single object
     file, normally the result of compiling a single source file.

     (linker) A portion of the object code that is a discrete unit.  If any
     part of a module is linked, the entire module must be linked.