原げん因いん

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

cause; origin; source

Refers to the reason something happens or the origin of a situation. Used in both concrete and abstract contexts. The irregular reading げいいん is occasionally heard but considered nonstandard.

• 事じ故この原げん因いんを調ちょう査さしています。

  We are investigating the cause of the accident.