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

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

(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.

plural of instrument approach

Alternative form of noninstrumented.

Maker of scientific instruments. / Maker of musical instruments.

(aviation) A collection of radio navigation aids (always including a localizer and glideslope, and often one to three marker beacons as well) used by pilots for approach guidance to a specific airport runway, especially when visibility is limited.

(music) an instrument that produces the concert pitch of E♭ when a C is written in the music

(music) an instrument that produces a concert pitch of B♭ when a C is written in the music