因いん由ゆ

noun, noun or participle which takes 'suru', intransitive verb

cause; reason; origin

Formal or literary term for the underlying cause or reason behind an event or situation. Often used in written or explanatory contexts.

• 事じ故この因いん由ゆを調ちょう査さする。

  Investigate the cause of the accident.

• この問もん題だいの因いん由ゆは何なんですか。

  What is the reason for this problem?