noun
immediate cause; proximate cause
Technical term often used in contrast with 遠因 (えんいん, remote cause). Refers to the direct trigger of an event.
See also: 遠因
事故の近因はブレーキの故障だった。
The immediate cause of the accident was brake failure.
歴史家は戦争の近因と遠因を区別する。
Historians distinguish between the proximate and remote causes of wars.