(noun, adjective)


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

- instrumental compositions

- an instrumental ensemble

2. acting helpful; serviceable; essential.

- instrumental in solving the crime

Similar word(s): helpful, implemental, subservient

Sentences with instrumental as an adjective:

- He was instrumental in conducting the business.

- instrumental music

- the instrumental case


1. (uncountable, grammar) The instrumental case.

2. (countable, music) A composition without lyrics.