instrument that shows the extent or amount or quantity or degree of something
a device that requires skill for proper use
the means whereby some act is accomplished
a person used by another to gain an end
the semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process
any of various devices or contrivances that can be used to produce musical tones or sounds
(law) a document that states some contractual relationship or grants some right
the act or process of assigning numbers to phenomena according to a rule
