1. A set of mental pictures or images. 2. The use of vivid or figurative language to represent objects, actions, or ideas; the use of expressive or evocative images in art, literature, or music; a group or body of related images, as in a painting or poem. 3. Representative images, particularly statues or icons; the art of making such images. 4. A technique in behavior therapy in which the patient uses pleasant fantasies to relax and counteract anxiety; both a mental process (as in imagining) and a wide variety of procedures used in therapy to encourage changes in attitudes, behavior, or physiological reactions. As a mental process, it is often defined as "any thought representing a sensory quality." It includes, as well as the visual, all the senses - aural, tactile, olfactory, proprioceptive, and kinesthetic.