(neuroanatomy) The autonomic nervous system.

(computing) A computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints.

Slogan for the reunification of China as one country, but with areas like Hong Kong and Taiwan with separate economic and political systems.

(automotive) The subsystem of an engine that takes in air from the environment and delivers it to the combustion chamber

(automotive) The subsystem of an engine that takes the products of the combustion chamber through a catalytic converter and silencer to the exhaust pipe

(philosophy) A consistent set of moral axioms or principles.

plural of dynamic system

plural of content management system

plural of alarm system

(Non-Oxford British English) alternative form of systematize