The act or process of introducing or the state of being introduced. A means, such as a personal letter, of presenting one person to another. Something recently introduced; an innovation:"He loathed a fork; it is a modern introduction which has still scarcely reached common people"(D.H. Lawrence). Something spoken, written, or otherwise presented in beginning or introducing something, especially: A preface, as to a book. Music A short preliminary passage in a larger movement or work. A basic introductory text or course of study.