<p><strong>Adjective</strong></p><ul><li>serving or acting as an instrument or means; useful; helpful.</li><li>performed on or written for a musical instrument or instruments: "instrumental music."</li><li>of or relating to an instrument or tool.</li><li>noting or pertaining to a case having as its distinctive function the indication of means or agency, as in certain inflected languages, such as Old English and Russian.</li><li>similar to such a case form in function or meaning, as the Latin instrumental ablative, "gladiō," meaning "by means of a sword."</li><li>pertaining to the semantic role of a noun phrase that indicates the inanimate, nonvolitional, immediate cause of the action expressed by a verb, as in "The rock broke the window" or "I broke the window with the rock."</li></ul><p><strong>Noun</strong></p><ul><li>the instrumental case.</li><li>a word in the instrumental case.</li><li>a musical composition played by an instrument or a group of instruments.</li></ul><p><strong>End of Response</strong></p>