- the twenty-second letter of the Greek alphabet (X, χ).
- the consonant sound represented by this letter.
- qi.
- one of two dynasties that ruled in China a.d. 479–502 and, as the Northern Ch'i, a.d. 550–77.
- the 22nd letter of the Greek alphabet (Χ, χ), a consonant, transliterated as ch or rarely kh
- (in Oriental medicine, martial arts, etc) vital energy believed to circulate round the body in currents
