the act of introducing, or bringing to notice.-the act of formally making persons known to each other; a presentation or making known of one person to another by name; as, the introduction of one stranger to another.-that part of a book or discourse which introduces or leads the way to the main subject, or part; preliminary; matter; preface; proem; exordium.-a formal and elaborate preliminary treatise; specifically, a treatise introductory to other treatises, or to a course of study; a guide; as, an introduction to english literature.