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.
The preparations are ninety percent complete.
nine percent
Literal percentage meaning, less common than the idiomatic 'nine parts out of ten' sense. Typically used in formal or statistical contexts.
This year's growth rate remained at nine percent.
His story is almost certainly true.
nearly; almost; eight or nine parts out of ten
almost certainly; in all probability; ten to one · near-completeness; ninety-nine percent finished
about ninety percent; nearly; almost · almost certainly; in all probability
Compound of 九 (nine) and 分 (part, portion). The idiomatic use as 'mostly' comes from the idea of nine out of ten parts.