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Preface (n.) Something spoken as introductory to a discourse, or written as introductory to a book or essay; a proem; an introduction, or series of preliminary remarks.
Preface (n.) The prelude or introduction to the canon of the Mass.
Preface (v. t.) To introduce by a preface; to give a preface to; as, to preface a book discourse.
Preface (v. i.) To make a preface.