之一 (zhī yī) means “one of (sth); one out of a multitude; one (third, quarter, percent etc)”. It is an HSK 4 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
他是最好的学生之一。
Tā shì zuì hǎo de xuéshēng zhīyī.
He is one of the best students.
Updated: 2026-07-18