art 1 (ärt)n. 1. Human effort to imitate, supplement, alter, or counteract the work of nature. 2. a. The conscious production or arrangement of sounds, colors, forms, movements, or other elements in a manner that affects the sense of beauty, specifically the production of the beautiful in a graphic or plastic medium. b. The study of these activities. c. The product of these activities; human works of beauty considered as a group.