1. engine cooling system equipment in a motor vehicle that cools the engine
  2. cooling system a mechanism for keeping something cool
  3. accounting system a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts
  4. endocrine system the system of glands that produce endocrine secretions that help to control bodily metabolic activity
  5. UNIX operating system trademark for a powerful operating system
  6. uninominal system based on the principle of having only one member (as of a legislature) selected from each electoral district
  7. uninominal voting system based on the principle of having only one member (as of a legislature) selected from each electoral district
  8. English system a system of weights and measures based on the foot and pound and second and pint
  9. economic system the system of production and distribution and consumption
  10. gambling system a system of rules for placing bets that is believed to lead to winning
  11. banking system banks collectively
  12. ignition system the mechanism that ignites the fuel in an internal-combustion engine
  13. recording system audio system for recoding sound
  14. mechanical system a system of elements that interact on mechanical principles
  15. operating system (computer science) software that controls the execution of computer programs and may provide various services
  16. nonlinear system a system whose performance cannot be described by equations of the first degree
  17. ventilating system a mechanical system in a building that provides fresh air
  18. ecosystem organisms interacting with their physical environment
  19. filing system a system of classifying into files
  20. urogenital system the system that includes all organs involved in reproduction and in the formation and voidance of urine