noun
ninety percent; nine-tenths
Used for proportions, rates, or figurative expressions meaning 'almost all'.
参加者の九割が賛成した。
Ninety percent of the participants agreed.
仕事は九割方終わった。
The work is about ninety percent done.
九分九厘 means 'almost certainly' or 'ninety-nine percent', a stronger near-certainty than 九割.
Compound of 九 (きゅう, 'nine') and 割 (わり, 'tenth, proportion').