1. The process of combining filaments into yarn by twisting them together or combining two or more parallel singles yarns (spun or filament) into plied yarns or cords. Cables are made by twisting plied yarns or cords. Twisting is also employed to increase strength, smoothness, and uniformity, or to obtain novelty effects in yarn. 2. A very high level of twist is added to single or plied yarns to make crepe yarns. This operation generally is called creping or throwing. 3. The process of adding twist to a filament yarn to hold the filaments together for ease in subsequent textile processing, etc.