bind ‧ er /ˈbaɪndə $ -ər/ BrE AmE noun
1 . [countable] a removable cover for holding loose sheets of paper, magazines etc ⇨ ↑ ring binder
2 . [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