Dependent on chance, luck, or an uncertain outcome: an aleatory contract between an oil prospector and a landowner.
Of or characterized by gambling: aleatory contests.
also a·le·a·to·ric (l--tôrk, -tr-) KEYMusic 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.
ETYMOLOGY: Latin letrius, from letor, gambler, from lea, game of chance, die