1. cooling system a mechanism for keeping something cool
  2. coolant system a cooling system that uses a fluid to transfer heat from one place to another
  3. coding system a system of signals used to represent letters or numbers in transmitting messages
  4. filing system a system of classifying into files
  5. scoring system a system of classifying according to quality or merit or amount
  6. voting system a legal system for making democratic choices
  7. gambling system a system of rules for placing bets that is believed to lead to winning
  8. writing system a method of representing the sounds of a language by written or printed symbols
  9. heating system utility to warm a building
  10. rating system a system of classifying according to quality or merit or amount
  11. coaling station a seaport where ships can take on supplies of coal
  12. recording system audio system for recoding sound
  13. ecosystem organisms interacting with their physical environment
  14. computing system a system of one or more computers and associated software with common storage
  15. linguistics the scientific study of language
  16. accounting system a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts
  17. lens system a transparent optical device used to converge or diverge transmitted light and to form images
  18. drainage system a system of watercourses or drains for carrying off excess water
  19. psycholinguistics the branch of cognitive psychology that studies the psychological basis of linguistic competence and performance
  20. banking system banks collectively