(1):

(v. t.) To introduce by a preface; to give a preface to; as, to preface a book discourse.

(2):

(v. i.) To make a preface.

(3):

(n.) The prelude or introduction to the canon of the Mass.

(4):

(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.