in·stru·ment ( n str -mnt)n. 1. A means by which something is done; an agency. 2. One used by another to accomplish a purpose; a dupe. 3. An implement used to facilitate work. See Synonyms at tool. 4. A device for recording, measuring, or controlling, especially such a device functioning as part of a control system. 5. Music A device for playing or producing music: a keyboard instrument. 6. A legal document, such as a deed, will, mortgage, or insurance policy. tr.v. (-m  nt ) in·stru·ment·ed, in·stru·ment·ing, in·stru·ments 1. To provide or equip with instruments. 2. Music To compose or arrange for performance. 3. To address a legal document to. [Middle English, from Old French, from Latin  nstr mentum, tool, implement, from nstruere, to prepare; see instruct.] |   variety of medical instruments |
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