Origin: Latin prefix pre-
Preface has 5 different meanings across 2 categories:
The beginning or introductory portion that comes before the main text of a document or book.
"The priest led the congregation in a solemn preface before beginning the central prayers of the Eucharist."
The part of the liturgy that precedes the main part of the Eucharist
In plain English: A preface is an introduction written by the author to explain why they wrote something before you start reading it.
"The author included a brief preface to explain his motivations for writing the book."
Usage: Use "preface" as a noun to refer specifically to an introductory section, whereas "introduction" is often preferred for general opening remarks. As a verb, it implies writing the preface rather than simply speaking about the topic beforehand.
To introduce or make a comment before (the main point).
"Before diving into the complex analysis, I want to preface my remarks by acknowledging the contributions of our team members."
In plain English: To preface something means to say what you are going to talk about before you start your main story.
"The author briefly prefaced his speech with an apology for being late."
The word "preface" entered English in the late 14th century via Middle French and Medieval Latin, originally meaning a speech or statement made before something else. It is built from roots that literally mean "speak beforehand," which aligns with its current use for an introductory section of a book.