1. depending on chance or random events; involving an element of luck or uncertainty
Usage: formal; often used in legal, philosophical, or artistic contexts
2. relating to or characterized by the use of chance procedures or indeterminacy in artistic creation
Usage: music and art criticism

Examples

• The outcome of the lottery is purely aleatory; no skill can influence the result.
• An aleatory contract depends on an uncertain event that neither party can control.
• The composer used aleatory techniques, allowing performers to make random choices during the piece.
• Weather patterns are largely aleatory, making long-term forecasts difficult.
• The success of the startup seemed aleatory rather than based on a solid business plan.
• Aleatory art movements challenged traditional notions of artistic control and intention.