Meaning of “instrument” - Learner’s Dictionary

instrument

noun [ C ] uk us /ˈɪnstrəmənt/
TOOL

a tool that is used for doing something:

scientific instruments
MUSIC

A2 an object that is used for playing music, for example a piano or drum

EQUIPMENT

a piece of equipment that is used for measuring speed, light, fuel level, etc

FOR ACHIEVING SOMETHING

someone or something that is used for achieving something:

The Internet is a very powerful instrument of communication.
→ See also wind instrument

(Definition of “instrument” from the Cambridge Learner’s Dictionary © Cambridge University Press)