Wiktionary
n. A (form of) rhyme in which the vowels and final (coda) consonants of stressed syllables (and, in modern English poetry, any following syllables to the end of the words) are identical in sound. (qualifier: Contrast with half rhyme.)
Wikipedia
Perfect rhyme — also called full rhyme, exact rhyme, or true rhyme — is a form of rhyme between two words or phrases, satisfying the following conditions:
- The stressed vowel sound in both words must be identical, as well as any subsequent sounds. For example, "sky" and "high"; "skylight" and "highlight".
- The articulation that precedes the vowel in the words must differ. For example, "bean" and "green" is a perfect rhyme, while "leave" and "believe" is not.
Word pairs that satisfy the first condition but not the second (such as the aforementioned "leave" and "believe") are technically identities (also known as identical rhymes or identicals). Homophones are sometimes classified as identical rhymes, though the classification isn't entirely accurate.
Usage examples of "perfect rhyme".
In his strong musical voice, he spoke with perfect rhyme and meter, the entire one hundred and eleven lines.
It was only after the twentieth verse that I was withdrawn, and each improvised and each a perfect rhyme, or else start over.