1. the quality or state of being determinate; the condition of being precisely fixed, defined, or determined.
Usage: formal; often used in philosophy, logic, and mathematics
2. in philosophy and physics, the principle that all events are completely determined by prior causes and conditions; the absence of randomness or free choice.
Usage: philosophical; contrasts with indeterminism

Examples

• The determinacy of the mathematical proof left no room for doubt.
• Philosophers debate whether determinacy or free will governs human behavior.
• The contract's determinacy was questioned because several terms remained ambiguous.
• In quantum mechanics, determinacy at the subatomic level is challenged by uncertainty principles.
• The determinacy of the outcome depended on the precise initial conditions of the experiment.