preamble [preambles](short statement or remark, especially an explanatory introduction to a formal document or statute) noun [UK: priː.ˈæm.bl̩] [US: pri.ˈæm.bl̩]
preface [prefaces](introduction before the main text) noun [UK: ˈpre.fɪs] [US: ˈpre.fəs]
