preface

US /ˈpref.ɪs/
UK /ˈpref.ɪs/
"preface" picture
1.

an introduction to a book, especially one that states the author's aims

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The author wrote a detailed preface explaining his motivations for writing the book.
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Always read the preface first to get an overview of the book's content.
:
forewordintroductionprologuepreambleopening
1.

to serve as an introduction or a preliminary to

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The short speech will preface the main presentation.
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He chose to preface his remarks with a personal anecdote.
:
introducebeginprecedeopencommence