plural of dynamical system

plural of buddy system

plural of expert system

(derogatory, banking, finance, economics) Non-bank financial institutions, that, like banks, borrow short and in liquid forms and lend or invest long in more illiquid assets.

public address system

plural of eliminatory system

(anatomy) The system through which digestive waste is removed from the body.

(rare) The state or period of being a sysop.

plural of legacy system

plural of political system