noun, adverb
nine parts out of ten; ninety percent; mostly
Used to indicate that something is almost complete or mostly the case. Often used adverbially with に or as a noun modifier with の.
準備は九分通り終わった。
The preparations are ninety percent complete.
彼の話は九分九厘本当だ。
His story is almost certainly true.
noun
nine percent
Literal percentage meaning, less common than the idiomatic 'nine parts out of ten' sense. Typically used in formal or statistical contexts.
今年の成長率は九分にとどまった。
This year's growth rate remained at nine percent.