atonality

n. (Music) absence of a key; atonal style of composition; alternative to the diatonic system

Atonality in its broadest sense describes music that lacks a tonal center, or key. Atonality in this sense usually describes compositions written from about 1907 to the present day where a hierarchy of pitches focusing on a single, central tone is not used as a primary foundation for the work. More narrowly, the term describes music that does not conform to the system of tonal hierarchies which characterized classical European music between the seventeenth and nineteenth centuries.
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Noun
1. the absence of a key; alternative to the diatonic system
(synonym) atonalism
(antonym) key, tonality
(hypernym) musical notation

atonality
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ATONALITÀ