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Wordnet 3.0

ADJECTIVE (2)

1. having the same sound (especially the same vowel sound) occurring in successive stressed syllables;
- Example: "note the assonant words and syllables in `tilting at windmills'"

2. having the same vowel sound occurring with different consonants in successive words or stressed syllables;


The Collaborative International Dictionary of English v.0.48:

Assonant \As"so*nant\, a. [L. assonans, p. pr. of assonare to sound to, to correspond to in sound; ad + sonare to sound, sonus sound: cf. F. assonant. See Sound.] 1. Having a resemblance of sounds. [1913 Webster] 2. (Pros.) Pertaining to the peculiar species of rhyme called assonance; not consonant. [1913 Webster]
WordNet (r) 3.0 (2006):

assonant adj 1: having the same sound (especially the same vowel sound) occurring in successive stressed syllables; "note the assonant words and syllables in `tilting at windmills'" 2: having the same vowel sound occurring with different consonants in successive words or stressed syllables