Wordnet 3.0
ADJECTIVE (2)
1. 
 being or containing or characterized by vowels; 
- Example: "vocalic sounds"- Example: "the Gaelic language being uncommonly vocalic"- Walter Scott2. 
 relating to or associated with or containing a vowel; 
- Example: "vocalic segments"- Example: "the vocalic ablaut"
The Collaborative International Dictionary of English v.0.48:
Vocalic \Vo*cal"ic\ (v[-o]*k[a^]l"[i^]k), a. [L. vocalis (sc.
   littera) a vowel. See Vocal, a.]
   Of or pertaining to vowel sounds; consisting of the vowel
   sounds. --Earle.
   [1913 Webster]
         The Gaelic language being uncommonly vocalic. --Sir W.
                                                  Scott.
   [1913 Webster]
WordNet (r) 3.0 (2006):
vocalic
    adj 1: being or containing or characterized by vowels; "vocalic
           sounds"; "the Gaelic language being uncommonly vocalic"-
           Walter Scott [ant: consonantal]
    2: relating to or associated with or containing a vowel;
       "vocalic segments"; "the vocalic ablaut"