What does the word instrument mean?

Usage examples for instrument

  1. Bruce picked up the instrument. – Counsel for the Defense by Leroy Scott
  2. With an astonished exclamation, Garrity put the instrument down. – Lefty Locke Pitcher-Manager by Burt L. Standish
  3. First he kept it to himself as a future instrument of profit. – Checkmate by Joseph Sheridan Le Fanu