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1. Resemblance of sound, especially of the vowel sounds in words, as in: "that dolphin-torn, that gong-tormented sea" (William Butler Yeats).
2. The repetition of identical or similar vowel sounds, especially in stressed syllables, with changes in the intervening consonants, as in the phrase tilting at windmills.
3. Rough similarity; approximate agreement.

[French, from Latin assonāre, to respond to : ad-, ad- + sonāre, to sound; see swen- in Indo-European roots.]

as′so·nant adj. & n.
as′so·nan′tal (-năn′tl) adj.
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References in periodicals archive ?
In magnifying the potential power of sound repetitions, it suggests how even the much less stringent rhyming of poems in couplets, or in the assonantal laisses of medieval French epic, provide phonetic themes that give order to segmental phones.
Gush" and the other primary stresses in stanza 8 are reinforced by the dense alliterative and assonantal pattern they emphasize: "lush," "plush," "gush," "flush"; "lash," "flash"; perhaps even "best, "last," "worst," "burst.
As corresponding or reminiscent in the text or rhetoric, consider these widely spaced passages of Dickens's alliterative, assonantal, often metrical prose: "Toby Veck, Toby Veck, waiting for you Toby
An aesthetic experience of Keats's Odes does indeed progressively refine, as Bate's Stylistic Development of Keats demonstrates in exquisite detail, the "raw morphological data" of assonantal, consonantal, and metric units.