serving as a means of pursuing an aim or policy
the Society was instrumental in bringing about legislation
(of music) performed on instruments, with no vocals
a largely instrumental piece
relating to an implement or measuring device
instrumental error
instrumental delivery of a baby
denoting or relating to a case of nouns and pronouns (and words in grammatical agreement with them) indicating a means or instrument
a piece of (usually non-classical) music performed by instruments, with no vocals
the opening tune is an instrumental
the instrumental case