Focus on the pronunciation of preface
English definition of “preface”
/ˈpref·əs/ n [C]
› literature something that comes before and introduces a more important thing, esp. an introduction at the beginning of a book that explains its aims: an author’s preface preface
/ˈpref·əs/ v [T] › He didn’t preface the bad news with "I don’t know how to tell you this, but."