(finance) A financial instrument that is marketable at close to par under almost all circumstances.

(finance, law) A document evidencing a debt; the debt so evidenced.

(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.

(music) Any musical wind instrument played by blowing air through a reed, such as the oboe or the clarinet.

An instrument whose calibration can be determined by means of physical measurements on the instrument.

plural of instrumental case

(literally) An object lacking sharp surfaces, especially as used to cause injury.

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

(music) an instrument that either does not transpose, or transposes by an octave or multiple octaves.

An astronomical telescope mounted in the meridian and turning on a fixed east-and-west axis.