assonance (n.) Look up assonance at Dictionary.com
1727, "resemblance of sounds between words," from French assonance, from assonant, from Latin assonantem (nominative assonans), present participle of assonare "to resound, respond to," from ad "to" (see ad-) + sonare "to sound" (see sonata). Properly, in prosody, "rhyming of accented vowels, but not consonants" (1823).