The definition of chi is the 22nd letter of the Greek alphabet.(noun)
An example of chi is the letter represented by χ.
See chi in Webster's New World College Dictionary
See chi in American Heritage Dictionary 4
Origin: Late Greek khī
Origin: , from earlier khei.
also ch'i or Qi or qinoun
Origin: Chinese (Mandarin) qì, air, spirit, energy of life.
Learn more about chi