/ ˈæsənəns; NAmE / noun
[ U ] ( technical ) the effect created when two syllables in words that are close together have the same vowel sound, but different consonants, or the same consonants but different vowels, for example, sonnet and porridge or cold and killed
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WORD ORIGIN
early 18th cent.: from French , from Latin assonare respond to, from ad- to + sonare (from sonus sound).