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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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Domination of Black" is not rhymed, but it is heavily assonantal ("night"-"fire"-"like"-"striding"-"cry"-"I"-"twilight"; "leaves"-"repeating"-"peacocks"; "came"-"they"-"flames"-"tails"-"afraid"; "boughs"-"down"-"ground"-"loud"-"how"; "heavy"-"hemlocks"-"remembered"-"swept"-"against"-"felt"; "turned"-"turning""were"-"heard"; "just"-"was"-"color").
The assonantal connections here between "clay," "Gray," "grace" and "day" draw the stanzas together, suggesting movement--from the soil to its colour to its absence of grace to the achievement of day.
6) Thus have Tennyson's words come to signal precisely that "abject space beyond words," to quote from Aidan Day; and likewise his assonantal patterns register a psychological "grotesque" that "lies not at the verbal surface .
The assonantal half-rhyming across these lines carries the poem along on a wave of sound that is paralleled by the attention to visual detail and color.
Notice, too, the assonantal magic at the end of "The Ache of Marriage":
I recogmize that this disparity might have other explanations, such as an assonantal preference on Keats's part for long e's.
Elsewhere, this "I in the night standing"--the pronoun invoked no fewer than five times--is poised against assonantal incursions of "0," to which "I" is nonetheless "lashed": ode, oak, rope, body; shadow, cloudy, coil, soul; bonds, songs, root, ghost.