+**Decay** is the natural, irreversible process where a complex system or substance gradually breaks down into simpler forms. This slow [Decomposition](/wiki/decomposition) or decline affects matter, energy, and abstract concepts, often signifying a progression through [Time](/wiki/time).
+## See also
+- [Erosion](/wiki/erosion)
+- [Entropy](/wiki/entropy)
+- [Degradation](/wiki/degradation)
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