1. A substance or mixture of substances added to textile materials to impart desired properties.

2. A process, physical or chemical, performed on textile materials to produce a desired effect.

3. A property, such as smoothness, drape, luster, water repellency, flame retardancy, or crease resistance that is produced by 1 and/or 2 above.

4. The state of a textile material as it leaves a process.