preface (n.) Look up preface at Dictionary.com
late 14c., from O.Fr. preface (14c.), from M.L. prefatia, from L. præfatio "fore-speaking, introduction, prologue," from præfatus, pp. of præfari "to say beforehand," from præ- "before" + fari "speak" (see fame). The verb is 1616, from the noun.