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