IPA: //eɪˈtoʊnəl//
KK: /ˈeɪtəʊnəl/
Describing music that does not have a central note or key, and does not follow traditional rules of tonality.
The composer is known for his atonal works that challenge conventional music structures.
Atonal → It is formed from "a-" (meaning without) and "tonal" (from Latin "tonus", meaning tone). The word "atonal" refers to music that lacks a tonal center or key, hence, without tone.
Think of 'without' ('a-') and 'tone' ('tonal') to remember that atonal music is music that lacks a specific tone.