looseleaf adjective 3noun 1 adjective3 •Consisting of loose leaves (pages), often collected in a binder, rather than being bound like a book or stapled.All the pages fell out of my looseleaf notebook. •Of tea: supplied as whole tea leaves rather than teabags. •Of lettuce: having loosely bunched leaves.Looseleaf lettuce is popularly used in salads. noun1 •Lined paper, usually collected in a binder.