Meaning of 口音 in Japanese

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Definition of 口音

こうおん(kouon) 【口音】

かいこうおん(kaikouon) 【開口音】

(n) (of Chinese) pronunciation of kanji without a medial between the initial consonant and center vowel
(of Japanese) the long "o" vowel arising from combination of the "a" and "u" sounds

ごうこうおん(goukouon) 【合口音】

(n) (of Chinese) pronunciation of kanji with a medial between the initial consonant and center vowel
(of Japanese) the long "o" vowel arising from combination of the "o" and "u" or "e" and "u" sounds