一一 yī yī 🔊 one by one; one after another HSK 6 + Review this word Meanings yī yī one by one; one after another Its characters 一yīoneHSK 1 In sentences Pinyin 今年jīn nián是shì二èr零líng一一yī yī年nián。This year is 2011. #5297688 Words with 一一 一一对应 yī yī duì yìng one-to-one correspondence 一一映射 yī yī yìng shè bijective map