binderPronunciation: /ˈbʌɪndə/Translate binder | into French | into German | into Italian | into Spanish Definition of binder noun 1a cover for holding magazines or loose sheets of paper together. 2a substance used to make other substances or materials stick or mix together. 3a reaping machine that binds grain into sheaves. 4a bookbinder. binder in other Oxford dictionaries Definition of binder in the US English dictionary