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Entry 4 senses Webster, 1913

Introduction

/ĭnˌ-trəd-ŭk'-shən/ · In·tro·duc·tion · IPA /ˌɪntɹəˈdʌkʃn̩/
01 n. The act of introducing, or bringing to notice.
  1. 1.
    The act of introducing, or bringing to notice.
  2. 2.
    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.
  3. 3.
    That part of a book or discourse which introduces or leads the way to the main subject, or part; preliminary; matter; preface; proem; exordium.
  4. 4.
    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.