adj. having rings that open and close permitting insertion and removal of pages; -- of notebooks and binders and the paper used in them; as, a looseleaf notebook; looseleaf paper. Syn. -- loose-leaf. [ WordNet 1.5 ]
n. A type of notebook with hard covers attached to metal rings which open, allowing sheets of writing paper to be conveniently inserted into it and removed from it. [ PJC ]