Synonyms for Chi (same or very similar meaning)
WordNet sense 1 (the circulating life energy that in Chinese philosophy is thought to be inherent in all things; in traditional Chinese medicine the balance of negative and positive forms in the body is believed to be essential for good health):
ch'i, Ki, qiWordNet sense 2 (the 22nd letter of the Greek alphabet):
khiFrom the ODE community, based on WordNetadd/edit