Determinism

This article is about the general notion of determinism in philosophy. For other uses, see Determinism (disambiguation).
Not to be confused with Fatalism, Predeterminism, Predictability, or Theological determinism.

Determinism is the metaphysical view that all events within the universe (or multiverse) can occur only in one possible way. Deterministic theories throughout the history of philosophy have developed from diverse and sometimes overlapping motives and considerations. Like eternalism, determinism focuses on particular events rather than the future as a concept. Determinism is often contrasted with free will, although some philosophers argue that the two are compatible. The antonym of determinism is indeterminism, the view that events are not deterministically caused.

Historically, debates about determinism have involved many philosophical positions and given rise to multiple varieties or interpretations of determinism. One topic of debate concerns the scope of determined systems. Some philosophers have maintained that the entire universe is a single determinate system, while others identify more limited determinate systems. Another common debate topic is whether determinism and free will can coexist; compatibilism and incompatibilism represent the opposing sides of this debate.

Determinism should not be confused with the self-determination of human actions by reasons, motives, and desires. Determinism is about interactions which affect cognitive processes in people's lives. It concerns the cause and effect of human actions. Cause and result are always bound together in cognitive processes. It assumes that if an observer has sufficient information about an object or human being, then such an observer might be able to predict every consequent move of that object or human being. Determinism rarely requires that perfect prediction be practically possible.

Causal determinism posits that every event results from preceding events and natural laws, while nomological determinism emphasizes the predictability of the future from past and present states. Necessitarianism claims only one possible world exists, and predeterminism suggests events are fixed in advance, sometimes biologically or genetically. Fatalism and theological determinism attribute outcomes to fate or divine omniscience, whereas adequate determinism and interpretations of quantum mechanics explore probabilistic or emergent constraints on macroscopic phenomena. Philosophical varieties extend to human behavior, including biological, psychological, social, and cultural determinism, as well as structural determinism, which highlights systemic constraints. Historically, determinism appears in both Western traditions, from the Presocratics and Stoics to Newtonian mechanics, and Eastern thought, including karma, Ājīvika fatalism, and Buddhist dependent origination. Modern science recognizes deterministic models in classical physics and complex generative processes, while quantum mechanics introduces probabilistic and debated interpretations.

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