isagoge

/ˌaɪsəˈɡoʊdʒi/
noun
  1. An introduction or introductory text, especially to a field of study or a literary work.
    • The professor wrote an isagoge to the study of ancient philosophy for new students.
    • The first chapter is an isagoge that outlines the main themes of the novel.
    • This book serves as an isagoge to the complex world of medieval poetry.
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