The DICT Development Group

  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]

  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

  48 Moby Thesaurus words for "assonant":
     accordant, according, alliteral, alliterating, alliterative,
     assonantal, attuned, belabored, blended, blending, chanting,
     chiming, cliche-ridden, concordant, consonant, dingdong, harmonic,
     harmonious, harmonizing, harping, homophonic, humdrum, in accord,
     in chorus, in concert, in concord, in sync, in tune, in unison,
     jingle-jangle, jingling, jog-trot, labored, monodic, monophonic,
     monotone, monotonous, punning, rhymed, rhyming, singsong,
     symphonious, synchronized, synchronous, tedious, tuned, unisonant,
     unisonous