DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   tonal
       adj 1: employing variations in pitch to distinguish meanings of
              otherwise similar words; "Chinese is a tonal language"
              [syn: tonic, tonal]
       2: having tonality; i.e. tones and chords organized in relation
          to one tone such as a keynote or tonic [ant: atonal,
          unkeyed]