instrumental

英 [ɪnstrʊ'ment(ə)l] 美[,ɪnstrə'mɛntl]

• adj. 乐器的；有帮助的；仪器的，器械的
• n. 器乐曲；工具字，工具格

1. relating to or designed for or performed on musical instruments;

"instrumental compositions"

"an instrumental ensemble"

2. serving or acting as a means or aid;

"instrumental in solving the crime"