原げん由ゆ

noun

reason; cause; origin

A somewhat formal or literary word for the underlying reason or cause of something. Often used in explanations or investigations.

• 事じ故この原げん由ゆを調ちょう査さする。

  Investigate the cause of the accident.

• 彼かれが辞じ職しょくした原げん由ゆは明あきらかではない。

  The reason for his resignation is not clear.