instrument /ˈɪnstrəmənt/ noun
plural instruments
plural instruments
Learner's definition of INSTRUMENT
: 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
: a device that measures something (such as temperature or distance)
: a device that is used to make music
see also wind instrument
: someone or something that can be used to do or achieve something
law : an official document that shows legal rights or duties