The quality of being determined, decided, or fixed; the state of having a definite or certain outcome.
From Latin determinatus (determined, set bounds) + -cy (suffix forming abstract nouns). This Latin past participle became the root for several English noun forms expressing states or conditions.
In physics and philosophy, determinacy is the opposite of indeterminacy—it asks whether the universe is fundamentally predictable or contains genuine randomness, a debate that's raged for 500 years.
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