instrument

the means whereby some act is accomplished

a device that requires skill for proper use

any of various devices or contrivances that can be used to produce musical tones or sounds

the semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process

a document that states some contractual relationship or grants some right

a person used by another to gain an end

address a legal document to

write an instrumental score for

equip with instruments for measuring, recording, or controlling