1. introducing or beginning something with preliminary remarks or statements
Usage: present participle of ‘preface’

Examples

• She is prefacing her speech with a brief thank you to the organizers.
• The author is prefacing each chapter with a relevant quote.
• He began prefacing his comments with a disclaimer about his expertise.
• The professor is prefacing the lecture with some background information.
• They are prefacing the announcement with an explanation of the circumstances.
• The director is prefacing the film screening with remarks about its historical context.