prefatory

/ˈprɛfəˌtɔri/
adjective
  1. Serving as an introduction or preface; coming before the main part.
    • The prefatory chapter of the textbook outlines the key concepts to be covered.
    • His prefatory remarks at the conference set the stage for the keynote speaker.
    • The author wrote a prefatory note explaining her inspiration for the novel.
Antonyms
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