instrument

instrument /ˈɪnstrəmənt/ noun
plural instruments
instrument
/ˈɪnstrəmənt/
noun
plural instruments
Britannica Dictionary definition of INSTRUMENT
[count]
1 
: a tool or device used for a particular purpose
especially : a tool or device designed to do careful and exact work
Synonyms see: [1]implement
2 
: a device that measures something (such as temperature or distance)
3 
: a device that is used to make music
— see also wind instrument
4 
: someone or something that can be used to do or achieve something
5 
law : an official document that shows legal rights or duties