母ぼ音いん交こう替たい

ぼ

い

ん

こ

う

た

い

Meanings

ablaut; vowel gradation; apophony

rare term

Linguistic term for systematic vowel changes within a root, such as sing/sang/sung. Rare in general use; mainly encountered in academic contexts.

vowel shift

Refers to a historical or systematic change in vowel pronunciation, such as the Great Vowel Shift. Also a technical term.