Exordium and Prelusion

Exordium noun - A short section (as of a book) that leads to or explains the main part.

Prelusion and exordium are semantically related in introduction topic. In some cases you can use "Prelusion" instead a noun "Exordium", when it comes to topics like introduction to a document, beginning of event.

Exordium and prelusion are semantically related in introduction topic. You can use "Exordium" instead a noun "Prelusion", if it concerns topics such as introduction to a document, beginning of event.