instrument

(noun) a device that requires skill for proper use.

(noun) the means whereby some act is accomplished. Synonyms: tool. Examples: "My greed was the instrument of my destruction." "Science has given us new tools to fight disease."

(noun) a person used by another to gain an end. Synonyms: pawn, cat's-paw.

(noun) (law) a document that states some contractual relationship or grants some right. Synonyms: legal document, legal instrument, official document.

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

(noun) 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.

(verb) write an instrumental score for. Synonyms: instrumentate.

(verb) address a legal document to.