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1. Dependent on chance, luck, or an uncertain outcome: an aleatory contract between an oil prospector and a landowner.
2. Of or characterized by gambling: aleatory contests.
3. also a·le·a·to·ric (ā′lē-ə-tôr′ĭk) Music Using or consisting of sounds to be chosen by the performer or left to chance; indeterminate: An object placed inside the piano added an aleatory element to the piece.

[Latin āleātōrius, from āleātor, gambler, from ālea, game of chance, die.]


[ˌeɪlɪəˈtɒrɪk] aleatory [ˈeɪlɪətərɪ] ADJaleatorio
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Specialists can see a huge difference between aleatoric music by John Cage and serial music by Pierre Boulez, but most people, even educated people, cannot.
In an interview with the pianist and writer Charles Rosen, Carter explains his view on the insufficiency of aleatoric music, "that the idea of having uncoordinated, separate things destroyed all sense of drama.
Listening to Because I'm Worth It can feel simultaneously as aleatoric and full of strange coincidences as standing at a busy street corner and soaking everything in.
To them, many artists engaging noncomposition today can appear problematically proud, as if congratulating themselves on how each decision about color, canvas shape, amount of pigment, and so on is subject either to some preconceived system or to some aleatoric operation.
Chapters discuss chromaticism within and beyond tonality in Germany and Austria; Neoclassicism; early interests in color, noise, and new sonorities; extensions of the 12-tone system in and outside Vienna; the continuation and development of trends established before World War I and new trends between the wars; atonal and 12-tone techniques after World War II; musique concrete, electronic, and aleatoric movements; and composers in Europe, the US, Latin America, and Eastern Asia since the mid-1940s.
In my research for my book on the philosophies of firing, which examined the rationales utilised by potters and clay artists in their methodologies of firing, I had felt that I had confirmed the hypothesis, suggested by Hirsch: there are just some clay artists who would never see a benefit to their work of aleatoric, random firing qualities and, indeed, by looking at different ceramics one can see that there are different sensibilities at play and that the split between spontaneity and control was deeply embedded in most ceramic psyches.
Noon disassembles and reconfigures the text using aleatoric modes as a means of revealing hidden truths of/ in language, just as his predecessors did; however, while Burroughs and Acker are interested in linguistic iconoclasm, Noon's project figures differently.
Such developments have caused poets to theorize an innovative aesthetics of "conceptual literature" that has begun to question, if not to abandon, the lyrical mandate of originality in order to explore the potentials of the "uncreative" be it automatic, mannerist, aleatoric, or readymade, in its literary practice.
Evocative motifs, epic themes, aleatoric dissonance or apocalyptic intensity: composer Garry Schyman explores a stunning spectrum of sonic possibilities.
Yet with hindsight this man preempted the Aleatoric music games of the following century if not that form of composition itself.
Depending on structure as we must, to help us make sense of the world, we do not know how well we understand a world that is increasingly improvisatory, aleatoric.
The test would require judges to make judgments about which portions of reality are deterministic and which are aleatoric.