noun

1. R.C.Ch. the introduction to the Canon of the Mass, ending with the Sanctus
2. an introductory statement to a book, telling its purpose, plan, etc., esp. a brief one written by the book's author
3. something preliminary or introductory; prelude

Etymology: ME prefas < MFr < ML prefatia, for L praefatio < prae-, before (see pre-) + fatus, pp. of fari, to speak: see fame

transitive verb prefaced -·aced, prefacing -·ac·ing

1. to furnish or introduce with a preface
2. to be or serve as a preface to; begin