Synonyms to divide in thirds

third, consecutive intervals, degree, diapason, diatessaron, diatonic interval, diatonic semitone, enharmonic diesis, enharmonic interval, fifth, fourth, half step, halftone, interval, irregular, less semitone, melodic interval, note, octave, parallel octaves, schlock, schmatte, second, semitone, seventh, sixth, step, tertiary, tierce, tone, trichotomize, trifurcate, unison interval, whole step