Translation

付属物 / 補助的なもの / 非常勤講師

Meaning

An adjunct is something added to another thing but not treated as its main part. In universities, an adjunct is often a part-time or temporary instructor. The trap is reading it as adjacent, which only means next to.

Examples

• このオンライン資料は教科書の補助教材です。
  This online resource is an adjunct to the textbook.
• 彼女はその大学で非常勤講師として教えています。
  She teaches as an adjunct at the university.