aleatory

/ˈeɪliəˌtɔri/
adjective
  1. Depending on chance, luck, or an uncertain outcome; random.
    • The winner of the raffle was determined by an aleatory drawing of names.
    • Some investors prefer stable returns over aleatory gains from risky stocks.
    • The game's aleatory elements make each playthrough different and exciting.
  2. Relating to music or art that involves elements of chance or improvisation.
    • The composer used aleatory techniques, letting the performers choose the order of sections.
    • Aleatory art often surprises the creator as much as the audience.
    • In his aleatory piece, the pianist rolled dice to decide which notes to play next.
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