Definitions from Wiktionary (instrumental)

▸ adjective:  Essential or central; of great importance or relevance.
▸ adjective:  Serving as an instrument, medium, means, or agency.
▸ adjective:  (music) Pertaining to, made by, or prepared for an instrument, especially a musical instrument (rather than the human voice).
▸ adjective:  (music) A pause in the vocals of a song, usually occurring midway through, in which a musical instrument replaces the vocals.
▸ adjective:  (grammar) Applied to a case expressing means or agency, generally corresponding to the English use of prepositions such as by, with, through, or by means of with the objective case.
▸ noun:  (grammar) The instrumental case.
▸ noun:  (music) A composition written or performed without lyrics or singing, using a lead instrument to replace vocals.

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