What does 要因 mean?
要因 is a Japanese noun meaning “primary factor, main cause” in English. It is written as 要因 in kanji, よういん in hiragana, and youin in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
Ｂ要因の取り扱いに関して、両者のアプローチにはわずかな違いがあるようだ。
There seems to be a slight difference on the treatment of the B factor between their approaches.