The beginning or introductory portion that comes before the main text of a document or book.
The book included a brief preface by a leading expert in the field.
An introduction, or series of preliminary remarks.
The prelude or introduction to the canon of the Mass.
A title or epithet.
To introduce or make a comment before (the main point).
Let me preface this by saying that I don't know him that well.
To give a preface to.
to preface a book