Aleatory means "pertaining to luck", and derives from the Latin word alea, the rolling of dice. Aleatoric, indeterminate, or chance art is that which exploits the principle of randomness.
[adj] dependent on chance; "the aleatory element in life"
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\A"le*a*to*ry\, a. [L. aleatorius, fr. alea chance, die.] (Law) Depending on some uncertain contingency; as, an aleatory contract. --Bouvier.