assonance
US /ˈæs.ən.əns/
UK /ˈæs.ən.əns/
1.
in poetry, the repetition of the sound of a vowel or diphthong in non-rhyming stressed syllables near enough to each other for the echo to be discernible (as in penitent and reticence).
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The poem used assonance with the repeated 'o' sound in 'old' and 'cold'.
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The phrase 'Hear the mellow wedding bells' is an example of assonance.