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  1. percussion instrument a musical instrument in which the sound is produced by one object striking another
  2. percussive instrument a musical instrument in which the sound is produced by one object striking another
  3. brass instrument a wind instrument that consists of a brass tube (usually of variable length) that is blown by means of a cup-shaped or funnel-shaped mouthpiece
  4. transit instrument a telescope mounted on an axis running east and west and used to time the transit of a celestial body across the meridian
  5. surgical instrument a medical instrument used in surgery
  6. derivative instrument a financial instrument whose value is based on another security
  7. navigational instrument an instrument used for navigating
  8. drafting instrument an instrument used by a draftsman in making drawings
  9. musical instrument any of various devices or contrivances that can be used to produce musical tones or sounds
  10. surveying instrument an instrument used by surveyors
  11. execution of instrument (law) the completion of a legal instrument (such as a contract or deed) by signing it (and perhaps sealing and delivering it) so that it becomes legally binding and enforceable
  12. commercial instrument a document of or relating to commerce
  13. purchasing department the division of a business that is responsible for purchases
  14. surveyor's instrument an instrument used by surveyors
  15. free-reed instrument a wind instrument with a free reed
  16. optical instrument an instrument designed to aid vision
  17. medical instrument instrument used in the practice of medicine
  18. keyboard instrument a musical instrument that is played by means of a keyboard
  19. measuring instrument instrument that shows the extent or amount or quantity or degree of something
  20. beating-reed instrument a musical instrument that sounds by means of a vibrating reed