instrument: meaning and definitions

A tool or implement used to do or facilitate work, especially a small precision tool used by a professional: sterilized the scalpel and other surgical instruments.

A device for recording, measuring, or controlling, especially such a device functioning as part of a control system.

Music A device designed to enable a person to make musical sounds, as by blowing into it, striking it, depressing the keys on a keyboard, or plucking, strumming, or running a bow over strings.

A means by which something is done; an agency:"The gods are just, and of our pleasant vices / Make instruments to plague us"(Shakespeare).

One used by another to accomplish a purpose; a dupe.

A legal document, especially one that represents a right of payment or conveys an interest, such as a check, promissory note, deed, or will.

To provide or equip with instruments.

Music To compose or arrange for performance.