Diatonic and Polytonal

Diatonic adjective - Based on or using the five tones and two semitones of the major or minor scales of western music.

Polytonal and diatonic are semantically related. In some cases you can use "Polytonal" instead an adjective "Diatonic".

Polytonal adjective - Using more than one key or tonality simultaneously.

Diatonic and polytonal are semantically related. You can use "Diatonic" instead an adjective "Polytonal".