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  1. reticular activating system the network in the reticular formation that serves an alerting or arousal function
  2. reticuloendothelial system a widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
  3. recording system audio system for recoding sound
  4. lubricating system mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings
  5. disk operating system an operating system that is on a disk
  6. force-feed lubricating system mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings
  7. ventilating system a mechanical system in a building that provides fresh air
  8. color television system a television that transmits images in color
  9. uninominal voting system based on the principle of having only one member (as of a legislature) selected from each electoral district
  10. receiving system set that receives radio or tv signals
  11. operating system (computer science) software that controls the execution of computer programs and may provide various services
  12. refrigeration system a cooling system for chilling or freezing
  13. articulatory system the system of joints in the body
  14. reproductive system organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring
  15. scrutin uninominal voting system based on the principle of having only one member (as of a legislature) selected from each electoral district
  16. colour television system a television that transmits images in color
  17. articulate express or state clearly
  18. quadraphonic system a stereophonic sound recording or reproducing system using four separate channels
  19. quadriphonic system a stereophonic sound recording or reproducing system using four separate channels
  20. accounting system a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts