Assonance is the repetition of identical or similar phonemes in words or syllables that occur close together, either in terms of their vowel phonemes (e.g., lean green meat) or their consonant phonemes (e.g., Kip keeps capes ).[1] However, in American usage, assonance exclusively refers to this phenomenon when affecting vowels, whereas, when affecting consonants, it is generally called consonance.[2] The two types are often combined, as between the words six and switch, which contain the same vowel and similar consonants. If there is repetition of the same vowel or some similar vowels in literary work, especially in stressed syllables, this may be termed "vowel harmony" in poetry[3] (though linguists have a different definition of "vowel harmony").
A special case of assonance is rhyme, in which the endings of words (generally beginning with the vowel sound of the last stressed syllable) are identical—as in fog and log or history and mystery. Vocalic assonance is an important element in verse.[4] Assonance occurs more often in verse than in prose; it is used in English-language poetry and is particularly important in Old French, Spanish, and the Celtic languages.