Ondo is one of the subjects of Daigaku-ryo, an educational institution under the system of centralized administration established under the Ritsuryo Legal Codes in Japan, to learn the Han pronunciations of Chinese characters in order to allow the reading aloud of the scriptures of Confucianism with the original pronunciations.
音道（おんどう）とは、日本律令制の大学寮において、儒教経典をそのまま音読するために必要な漢音（中国語）の発音について習う学科。