An example of to preface is to explain why you are telling a story.
An example of a preface is the first part of a book.
An informal brunch served as a preface to the three-day conference.
Let me preface this by saying that I don't know him that well.
To preface a book.
Origin of preface
- Middle English from Old French from Latin praefātiō praefātiōn- from praefātus past participle of praefārī to say before prae- pre- fārī to speak bhā-2 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition