Subsystem (noun)

A secondary and subordinate system that is part of a larger system.

Origin:

From latin sub-, meaning 'under' or 'below' and system, meaning 'a set of things working together as parts of a mechanism or an interconnecting network.'.

Examples:

1. The human body consists of several subsystems, including the circulatory, digestive, and nervous systems.
2. The city's transportation subsystem was severely impacted by the storm, causing widespread delays and cancellations.
3. The subsystem of the spacecraft responsible for power generation experienced a temporary failure, causing a power outage.
4. The financial subsystem of the company consisted of several departments, including accounting, tax, and treasury.
5. The subsystems of the computer were integrated seamlessly, creating a well-functioning machine.