What does 主因 mean?
主因 is a Japanese noun meaning “main cause” in English. It is written as 主因 in kanji, しゅいん in hiragana, and shuin in romaji. This word is part of JLPT N1 vocabulary.
Example sentences
事故の主因は居眠り運転でした。
The main cause of the accident was falling asleep at the wheel.
ストレスが病気の主因です。
Stress is the main cause of the illness.