This is the 1000th most frequent Japanese word.
訳
"訳" means "reason," "meaning," or "translation."
訳 (translated text or interpretation)
この訳はとても正確です。
This translation is very accurate.
訳 (reason or cause)
彼が来ない訳がわからない。
I don't understand the reason why he isn't coming.
訳 (reason or explanation)