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English definition of “preface”

preface

noun [C] uk   /ˈpref.ɪs/ us  
an introduction at the beginning of a book explaining its aims: In his preface, the author says that he took eight years to write the book. a preface to sth an event that comes before something more important: We're hoping these talks could be a preface to peace.

preface

verb [T] uk   /ˈpref.ɪs/ formal us  
If you preface your words or actions with something else, you say or do this other thing first: Each work is prefaced by a descriptive note and concludes with an author's note. I should like to preface my response with the following observation.
(Definition of preface from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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