noun

• A tool, implement used for manipulation or measurement.
  "Flight within clouds must be made by reference to your instruments."
• (law) A legal document, such as a contract, deed, trust, mortgage, power, indenture, or will.
  "A bond indenture is the instrument that gives a bond its value."
• (figuratively) A person used as a mere tool for achieving a goal.
  "Or useful serving man and instrument, / To any sovereign state."

verb

• (transitive) To apply measuring devices.
  "an instrumented test article"
• (transitive) To devise, conceive, cook up, plan.
  "When the Lit. Mongers deign to notice his work, they dismiss him as a "cult writer," another of their standard ploys. Purdy, not really bitter at the instrumented silence and sneers of the bookchat legions, […]"