一因
Meanings
1
one cause; one factor; one reason
Used to indicate one contributing factor among several, often in explanations of events or situations. Common in formal and written contexts.
One 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.