Definition of instrument:

part of speech: noun

A tool; contrivance for producing musical tones; contract in writing.

part of speech: noun

A tool or utensil: a machine producing musical sounds: a writing containing a contract: one who or that which is made a means.

part of speech: noun

That by which anything is accomplished; a tool; a mechanical contrivance for producing musical sounds; agent; a writing containing the terms of a contract; as, a deed.

Usage examples for instrument:

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