aton·al
(ˌ)ā-ˈtō-nᵊl
(ˌ)a-
: marked by avoidance of traditional musical tonality
especially
: organized without reference to key or tonal center and using the tones of the chromatic scale impartially
ato·nal·i·ty
¦ā-tō-ˈna-lə-tē
¦a-
plural -es
: a style of composition in which the musical material is organized without reference to key or tonal center and in which the tones of the chromatic scale are used impartially
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Merriam-Webster unabridged



