aleatory

a•le•a•to•ry

[[t]ˈeɪ li əˌtɔr i, -ˌtoʊr i, ˈæl i-[/t]] also a•le•a•tor•ic [[t]ˌeɪ li əˈtɔr ɪk, -ˈtɒr-, ˌæl i-[/t]] adj.

1) law Law. depending on an uncertain event:

an aleatory contract[/ex]

2) of or pertaining to luck or chance; unpredictable

3) mus mad employing the element of chance in the choice of tones, rests, durations, rhythms, dynamics, etc

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Etymology: 1685–95; < L āleātōrius, adj. der. of āleātor gambler (āle(a) game of chance)