one third; a third
Standard fractional expression; used in mathematical, everyday, and formal contexts.
I ate one third of the cake.
One third of the participants were women.
Standard kanji spelling for the fraction one third.
Mixed kanji-numeral spelling, common in informal or space-constrained writing.
Compound of 三 (san, 'three') + 分 (bun, 'part') + の (no, possessive particle) + 一 (ichi, 'one'), literally 'one of three parts'.