adverb
about ninety percent; nearly; almost
Describes a state that is almost complete or nearly finished; often used with verbs like 出来上がる or 完成する.
工事は九分通り終わっている。
The construction is about ninety percent finished.
準備は九分通り整った。
The preparations are nearly complete.
adverb
almost certainly; in all probability
Expresses a high degree of certainty about a future event or outcome; similar to 十中八九.
彼は九分通り来るだろう。
He will almost certainly come.
九分通り成功すると思う。
I think it will succeed in all probability.
A general adverb for 'almost' or 'nearly'; 九分通り is more specific to a high degree of completion or probability.
Compound of 九分 (kubu, 'nine parts') and 通り (dōri, 'as; in accordance with'), literally meaning 'as nine parts out of ten', hence 'ninety percent' or 'almost'.