instrument

The definition of an instrument is a tool for doing work, particularly for scientific or artistic purposes.

(noun)

See instrument in Webster's New World College Dictionary

noun

1. a thing by means of which something is done; means
2. a person used by another to bring something about
a tool or implement, esp. one used for delicate work or for scientific or artistic purposes
any of various devices for indicating or measuring conditions, performance, position, direction, etc. or sometimes, for controlling operations, esp. in aircraft or rocket flight
any of various devices producing musical sound, as a piano, drum, violin, oboe, etc.
Law a formal document, as a deed, contract, etc.
Finance a written order or promise to pay a sum of money: a negotiable instrument

Origin: OFr < L instrumentum, a tool or tools, stock, furniture, dress < instruere: see instruct

transitive verb

See instrument in American Heritage Dictionary 4

noun

A means by which something is done; an agency.
One used by another to accomplish a purpose; a dupe.
An implement used to facilitate work. See Synonyms at tool.
A device for recording, measuring, or controlling, especially such a device functioning as part of a control system.
Music A device for playing or producing music: a keyboard instrument.
A legal document, such as a deed, will, mortgage, or insurance policy.