<p><strong>Noun</strong></p><ul><li>a mechanical tool or implement, especially one used for delicate or precision work: surgical instruments.</li><li>a contrivance or apparatus for producing musical sounds: a stringed instrument.</li><li>a means by which something is effected or done; agency: an instrument of government.</li><li>a device for measuring the present value of a quantity under observation.</li><li>a mechanical or electronic measuring device, especially one used in navigation: landing a plane by instruments.</li><li>a formal legal document, as a draft or bond: negotiable instruments.</li><li>a person used by another merely as a means to some private end; tool or dupe.</li></ul><p><strong>Verb</strong></p><ul><li>to equip with instruments, as a machine or manufacturing process: to instrument a space vehicle.</li><li>to arrange a composition for musical instruments; orchestrate.</li></ul>