1》 a tool or implement, especially for precision work.
2》 a measuring device, especially in a vehicle or aircraft.
3》 (also musical ~ ) a device for producing musical sounds.
4》 a means of pursuing an aim.
5》 a person who is made use of.
6》 a formal or legal document.
■ verb equip with measuring ~s.
ME: from OFr., or from L. ~um 'equipment, implement', from instruere 'construct, equip'.