同一 (tóng yī) means “identical; the same”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
我们在同一所大学毕业。
Wǒmen zài tóng yī suǒ dàxué bìyè.
We graduated from the same university.
Updated: 2026-07-18