Kan'on, a Sino-Japanese kanji pronunciation layer; based mainly on the Chinese pronunciation in use in the areas around Chang'an (around modern-day Xi'an) and Henan, as imported into Japanese in the Nara period and the early Heian period in Japanese history, and roughly from the late Tang Dynasty through the early Song Dynasty in Chinese history. The predominant layer used in Japanese today, as opposed to the other layers which are associated with restricted sets of words (Buddhism, etc.).

(historical) under the 律令 (Ritsuryō) system, a position in the 陰陽寮 (On'yōryō) who specialized in Chinese-influenced astrology, cosmology, divination, and other occult practices

a practitioner of 陰陽道 (onmyōdō, “esoteric cosmology based on Chinese philosophy and traditional Japanese occult practices”)

(formal) sound; acoustics

Kyūjitai form of 音声: voice; speech

(music) tremolo

a greenhouse (building in which plants are grown more quickly than outside) / a hot bathhouse in a Buddhist temple

a loud rumbling or booming noise

sound and meaning / an annotated text that records the pronunciation and meaning of words, especially Chinese characters which are difficult to read or interpret

the process in which a sound becomes palatal; palatalization