sound change

(phonology) Any process of language change that affects pronunciation (phonetic change) or sound system structures (phonological change)

Japanese Meaning

音声変化または音韻変化とも呼ばれ、発音や音韻体系に影響を与える言語変化の過程

The sound change that merged the two vowels gradually transformed the dialect.

二つの母音を次第に融合させた音韻変化が、その方言を徐々に変えた。

Sense（1）

(phonology) Any process of language change that affects pronunciation (phonetic change) or sound system structures (phonological change)

sound changes

（ plural ）