Definition of: binder

(bīn′dər) noun
1. One who or that which binds.
2. One who binds books.
3. Agric. A device on a reaping machine for binding grain.
4. An attachment on a sewing machine to secure an edging.
5. A surety or written pledge for payment or performance of a contract.
6. A folder in which sheets of paper may be fastened, as for a notebook.
7. In painting, a material used to cause the pigment to adhere to a surface, as solutions of gum, glue, or casein, oils and resins, and (in fresco painting) lime.
8. In construction, a beam of steel or wood serving to support the bridging joists in a floor.
9. Metall. A substance used to promote the cohesion of crushed ore particles or finely powdered metallic dust before or in the process of sintering.
10. The cord or braiding which binds the edges of a fabric.