ATONAL Meaning of ATONAL in English (ˈ)ā|tōn ə l, (ˈ)a|- also əˈ- adjectiveEtymology: a- (II) + tonal : characterized by avoidance of traditional tonality• aton·al·ly - ə lē, -i adverb Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012