- noun a device for recording, measuring or controlling something, especially as part of a control system
- noun an electronic device that can produce a sound in response to a MIDI note or to a keyboard press
- An economic variable that is controlled by policy makers and can be used to influence other variables, called targets. Examples are monetary and fiscal policies used to achieve external and internal balance.
Origin & History of “instrument”
Instrument comes from the same source as instruct: the Latin verb instruere ‘build, prepare, equip, teach’. From it was derived the noun instrūmentum, which meant ‘tool, equipment’. when introduced into English via Old French at the end of the 13th century it was used for a ‘musical instrument’, but the more general ‘implement’ and the metaphorical ‘means’ soon followed in the 14th century.