Definition of "instrument" in English

noun

1. A device used to produce music.

   • The violinist was a master of her instrument.

2. A means or agency for achieving an effect.

3. A measuring or displaying device.

   • The instrument detected an increase in radioactivity.

4. A tool, implement used for manipulation or measurement.

   • The dentist set down his tray of instruments.
   • The scientist recorded the temperature with a thermometer, but wished he had a more accurate instrument.

5. (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.
   • Negotiable instruments are the foundation of the debt markets.

6. (figuratively) A person used as a mere tool for achieving a goal.

verb

1. (transitive) To apply measuring devices.

   • an instrumented test article

2. (transitive) To devise, conceive, cook up, plan.

3. To perform upon an instrument; to prepare for an instrument.

   • a sonata instrumented for orchestra