1. weapons system weapons considered collectively
  2. weapon system any instrument or instrumentality used in fighting or hunting
  3. ecosystem organisms interacting with their physical environment
  4. lens system a transparent optical device used to converge or diverge transmitted light and to form images
  5. spoils system the system of employing and promoting civil servants who are friends and supporters of the group in power
  6. defense system the weaponry available for the defense of a region
  7. point system a system of evaluation based on awarding points according to rules
  8. tense system a system of tenses used in a particular language
  9. phone system a communication system that transmits sound between distant points
  10. operating system (computer science) software that controls the execution of computer programs and may provide various services
  11. immune system a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response
  12. nervous system the sensory and control apparatus consisting of a network of nerve cells
  13. ABO system a classification system for the antigens of human blood
  14. reference system a system that uses coordinates to establish position
  15. filing system a system of classifying into files
  16. defence system the weaponry available for the defense of a region
  17. voting system a legal system for making democratic choices
  18. heating system utility to warm a building
  19. guidance system a system of equipment for automatically guiding the path of a vehicle (especially a missile)
  20. urinary system the system that includes all organs involved in reproduction and in the formation and voidance of urine

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