bind‧er /ˈbaɪndə $ -ər/ 
 noun1.   [countable] a removable cover for holding loose sheets of paper, magazines etc ⇒ 
ring binder2.  [countable] a person or machine that fastens the parts of a book together
3.  [uncountable and countable] a substance that makes things stick together
4.  [countable] American English an agreement in which you pay money to show that you intend to buy a property 
 [TahlilGaran] Dictionary of Contemporary English ▲