expression, noun
one fifth
Used as a noun or noun phrase to express the fraction 1/5. Often appears in mathematical, statistical, or comparative contexts.
このケーキの五分の一を食べました。
I ate one fifth of this cake.
参加者の五分の一が女性でした。
One fifth of the participants were women.
Compound of 五 (go, 'five') + 分 (bun, 'part') + の (no, possessive particle) + 一 (ichi, 'one'), literally 'one of five parts'.