The repetition of vowel sounds in words that are chose together to create rhyming.
Example:
And frightful a nightfall folded rueful a day
Nor rescue, only rocket and lightship, shone,
And lives at last were washing away:
To the shrouds they took,—they shook in the hurling and horrible airs.
Is out with it! Oh,
We lash with the best or worst
Word last! How a lush-kept plush-capped sloe
Will, mouthed to flesh-burst,
Gush!—flush the man, the being with it, sour or sweet,
Brim, in a flash, full!—Hither then, last or first.
Why is it important in Language Arts?
Assonance can create rhyming when add rhythm, beat or music into poems. Assonance can also affect the tone and mood of the poem.