The quality or state of happening by chance or accident rather than by design or necessity; the principle that events can occur randomly without predetermined causes.
From casual (accidental, by chance) + -ity (abstract noun suffix); related to Latin casus meaning chance or accident.
The word 'casuality' is incredibly rare compared to its opposite 'causality'—which is itself revealing, since English speakers far more often discuss cause-and-effect than randomness, suggesting we're psychologically predisposed to seek patterns even where none exist.
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