instrument

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instrument tool, implement XIII (earliest of a musical instrument); something used by an agent; means XIV; legal document XV. — (O)F. — L. instrūmentum, f. instruere; see prec. and -MENT.
So instrumental serving as instrument or means XIV; of music composed for instruments XVI (whence instrumentalist XIX); (gram.) XIX. instrumentation composition of music for instruments XIX. instrumentality XVII.

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