From Longman Dictionary of Contemporary Englishbinderbind‧er /ˈbaɪndə $ -ər/ noun 1 
[countable]TCNSE a removable cover for holding loose sheets of paper, magazines etc → ring binder2 [countable]TCN a person or machine that fastens the parts of a book together3 [countable, uncountable]TJOIN something TOGETHER a substance that makes things stick together4 [countable] American EnglishBPAY FOR an agreement in which you pay money to show that you intend to buy a property
[countable]TCNSE a removable cover for holding loose sheets of paper, magazines etc → ring binder2 [countable]TCN a person or machine that fastens the parts of a book together3 [countable, uncountable]TJOIN something TOGETHER a substance that makes things stick together4 [countable] American EnglishBPAY FOR an agreement in which you pay money to show that you intend to buy a propertyExamples from the Corpus
binder• Then she remembered a binder that held personal and financial information.• The process starts by mixing metal powder with a liquid containing a cellulose binder.• It is becoming an essential binder in the structure of a civilisation created by the application of science to industry.• Bequeath your heirs a well-organized set of financial and personal records in a loose-leaf binder or computer program.• I rammed my books and my binders into my briefcase.• No bananas or rice, because they are natural binders.• Each bank was offered binders containing a stack of papers 12 inches thick.• Will the binder be potato, bread crumbs, mayo or a combination?From Longman Business Dictionarybinderbind‧er /ˈbaɪndə-ər/ noun [countable] LAWINSURANCE a temporary contract that shows an agreement has been made, and is used until the formal contract has been prepared 