chi
noun
(energy)
[ U ] medical uk/tʃiː/ us/tʃiː/ (or qi)气（中医理论中人体内最重要的能量）
in some systems of Chinese medicine and exercise, the most important energy that a person has
(letter)
[ C or U ] language, mathematics, science /kaɪ/ /kaɪ/（希腊语字母表的第22个字母）
the 22nd letter of the Greek alphabet