(rail transport, UK) An instrument installed in a cabinet, used in block signalling installations.

(aviation) An airline selected by government to represent the country.

plural of instrument approach

Maker of scientific instruments. / Maker of musical instruments.

(aviation, usually in the plural) A device that measures and displays data concerning one or more aspects of the situation of an aircraft, such as its altitude, attitude, airspeed, etc.

(aviation) An approach (pre-landing procedure) using flight instruments for some or all navigation to the landing airport and runway, as opposed to one flown solely by visual reference to the ground.

(UK, Canada, Australia, law) In some common law jurisdictions, a form of delegated legislation enacted under a power derived from an act of parliament.

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

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

(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.