Synonyms to trichotomize

third, consecutive intervals, degree, diapason, diatessaron, diatonic interval, diatonic semitone, divide in thirds, 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, trifurcate, unison interval, whole step