pentatonic Syllabification: (pen·ta·ton·ic)Pronunciation: /ˌpentəˈtänik/Definition of pentatonic adjective Music relating to, based on, or denoting a scale of five notes, especially one without semitones equivalent to an ordinary major scale with the fourth and seventh omitted. Derivatives pentatonicismPronunciation: /-ˈtänəsizəm/ noun pentatonic in other Oxford dictionaries Definition of pentatonic in the British & World English dictionary