n. Something that serves as a means to the effecting of an end; anything that contributes to the production of an effect or the accomplishment of a purpose; a means; an agency.n. Specifically Something used to produce a mechanical effect; a contrivance with which to perform mechanical work of any kind; a tool, implement, utensil, or machine.n. Specifically In music, a mechanical contrivance or apparatus for producing musical soundsāthat is, for setting up, either in a solid body or in a confined body of air, vibrations sufficiently rapid, regular, and definite to produce tones systematically related to one another.n. One who is used by another; a human tool.n. In law, a writing given as the means of creating, securing, modifying, or terminating a right, or affording evidence, as a writing containing the terms of a contract, a deed of conveyance, a grant, a patent, an indenture, etc.n. See the adjectives. Synonyms Implement, Utensil, etc. See tool.In music, to compose or arrange for instruments, especially for an orchestra; score.