Diatonic

Definition: Based on or derivable from an octave of seven notes in a particular configuration, as opposed to Chromatic and other forms of Scale. A seven-note scale is said to be diatonic when its octave span is filled by five tones and two semitones, with the semitones maximally separated, for example the major scale (T–T–S–T–T–T–S). The natural minor scale and the church modes are also diatonic