Preamble

1. (n.) An introduction or preface which explains reasons and intent.

2. (v. t. & i.) To make a preamble to; to preface; to serve as a preamble.

Thesaurus Entries

avant-propos, breakthrough, exordium, foreword, front matter, frontispiece, innovation, introduce, introduction, leap, overture, postulate, preface, prefix, prefixture, preliminary, prelude, premise, presupposition, proem, prolegomena, prolegomenon, prolepsis, prologize, prologue, protasis, verse, voluntary