prolegomenon

n. opening section; introduction; preface

Prolegomenon (plural "prolegomena") refers to any critical introduction or essay at the start of a book. Prolegomena to Any Future Metaphysics is one of the shorter works by the German philosopher Immanuel Kant. It was published in 1783, two years after the first edition of his Critique of Pure Reason.
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(n.)
A preliminary remark or observation; an introductory discourse prefixed to a book or treatise.
  

prolegomenon /prolegomenon/
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