1. accounting system a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts
  2. operating system (computer science) software that controls the execution of computer programs and may provide various services
  3. exhaust system system consisting of the parts of an engine through which burned gases or steam are discharged
  4. writing system a method of representing the sounds of a language by written or printed symbols
  5. recording system audio system for recoding sound
  6. computing system a system of one or more computers and associated software with common storage
  7. coding system a system of signals used to represent letters or numbers in transmitting messages
  8. existentialism a philosophy that assumes that people are entirely free
  9. heating system utility to warm a building
  10. pricing system a system for setting prices on goods or services
  11. rating system a system of classifying according to quality or merit or amount
  12. voting system a legal system for making democratic choices
  13. ventilating system a mechanical system in a building that provides fresh air
  14. UNIX operating system trademark for a powerful operating system
  15. measuring system instrument that shows the extent or amount or quantity or degree of something
  16. receiving system set that receives radio or tv signals
  17. steering system a mechanism by which something is steered
  18. cooling system a mechanism for keeping something cool
  19. gambling system a system of rules for placing bets that is believed to lead to winning
  20. digestive system the system that makes food absorbable into the body