Webster's English Dictionary

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instrumental

in.stru.men.tal \.in(t)-str*-'ment-*l\ \-*l-e-\ aj 1a: serving as a means, 
   agent, or tool  1b: of, relating to, or done with an instrument or tool  2: 
   relating to, composed for, or performed on a musical instrument  3: of or 
   relating to a grammatical case or form (as a suffix) expressing m eans or 
   agency 4: of or relating to instrumentalism  - instrumental n