|1.||Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; |
|2.||(Mus.) Pertaining to, made by, or prepared for, an instrument, esp. a musical instrument; |
|3.||(Gram.) Applied to a case expressing means or agency; |
|Adj.||1.||instrumental - relating to or designed for or performed on musical instruments; "instrumental compositions"; "an instrumental ensemble"|
vocal - relating to or designed for or using the singing voice; "vocal technique"; "the vocal repertoire"; "organized a vocal group to sing his compositions"
|2.||instrumental - serving or acting as a means or aid; "instrumental in solving the crime"|