binder

(bīnˈdər)

1. One that binds, especially a bookbinder.
2. Something, such as a cord, used to bind.
3. A notebook cover with rings or clamps for holding sheets of paper.
4. Something, such as the latex in certain paints, that creates uniform consistency, solidification, or cohesion.
5. a. A machine that reaps and ties grain.
   b. An attachment on a reaping machine that ties grain in bundles.
6. Law A payment or written statement making an agreement legally binding until the completion of a formal contract, especially an insurance contract.
7. Ecology A plant, such as certain grasses or ground covers, whose habit of growth prevents the erosion of sand or soil.