一因 (いちいん, ichiin) Japanese meaning: one cause | KotomoraOne cause of the accident was excessive speed.
One factor in his success is the support of his family.
Usage patterns
〈事〉の一因となるto be one cause/factor behind ~
Lack of exercise is one factor contributing to obesity.
一因は〈事〉にあるone cause lies in ~
It is thought that one cause of the accident lies in the driver's carelessness.
〈事〉が一因だ~ is one of the causes
The economic slump is one factor behind the rise in unemployment.
〈事〉の一因を探るto investigate a cause of ~
Researchers are investigating one of the causes of the disease.
