What is the meaning of instrument?

noun

• A device that requires skill for proper use.
• The means whereby some act is accomplished.
  • usage: "my greed was the instrument of my destruction"; "science has given us new tools to fight disease"
  • synonyms: tool
• A person used by another to gain an end.
  • synonyms: pawn, cat's-paw
• Law) a document that states some contractual relationship or grants some right.
  • synonyms: legal document, legal instrument, official document
• The semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process.
  • synonyms: instrumental role
• Any of various devices or contrivances that can be used to produce musical tones or sounds.
  • synonyms: musical instrument

verb

• Equip with instruments for measuring, recording, or controlling.
• Write an instrumental score for.
  • synonyms: instrumentate
• Address a legal document to. .