前述

1. Origins, structure, and basic meaning

• Structure: 前述 combines 前, before, with 述, stating or describing, to refer to something stated earlier.
• Basic usage: It is a formal expression used to refer back to reasons or information already explained in writing or a presentation.

2. Common pitfalls and similar expressions

• 前述 and 後述
  • 前述 points back to material already covered, while 後述 points ahead to material to be covered later. The direction is relative to the current point in the text.
• Position and prior explanation
  • 上記 refers to something written above in a document, while 前述 refers to something previously described. 前述したとおり means as explained earlier.