- The definition of a subsystem is a smaller method or procedure within a larger set of methods or procedures.
An example of a subsystem is the way a department works in a larger company.
subsystem definition by Webster's New World
subsystem - Computer Definition
A unit or device that is part of a larger system. For example, a disk subsystem is a part of a computer system. A bus is a part of the computer. A subsystem usually refers to hardware, but it may be used to describe software. However, "module," "subroutine" and "component" are more typically used to describe parts of software.