the opening section of a book that serves as an introduction to the work and its themes and aims, among other things; the preliminary or introductory portion of a speech;
e.g. The preface of this book describes where the author found their inspiration for writing it.
(verb)
to make, say, or write introductory remarks that may also serve as a preface;
e.g. She prefaced the novel with a short introduction.
(verb)
to stand or be located in front of;
e.g. A grand porch prefaces the entrance to the house.