(philosophy) A specific form of rationality focusing on the most efficient or cost-effective means to achieve a specific end, but not in itself reflecting on the value of that end.

A remixed song which lacks the vocal tracks.

A device, object, contrivance or machine used to produce musical notes or sounds.

(grammar) A noun case used to express means or agency—and is generally indicated in English by by or with with the objective. Languages that use the instrumental case include Armenian, Serbo-Croatian, Czech, Dyirbal, Georgian, Latvian, Slovene, Polish, Quechua, Russian, Assamese, Turkish and Sanskrit. Extinct languages that used the instrumental case include Old English, Old Saxon and Old High German.

(music) Any musical instrument that produces sound when air flows through it; a woodwind instrument or brass instrument.

A flat, (usually) vertical surface onto which controls, instruments, and displays are mounted.

A coin or other item of currency.

Any musical instrument whose tone is produced by vibration of the lips as the player blows into a mouthpiece (or tubular resonator).

(music) An instrument in which the sound is produced by striking, scraping or shaking an object.

(optics) The width of a fringe formed in monochromatic light.