+**Irreversibility** is the characteristic of a process that cannot be reversed, leaving a system unable to return to its original [state](/wiki/state) without external intervention. It embodies the [arrow of time](/wiki/arrow_of_time), dictating the one-way progression of many natural phenomena and the inherent transformation of systems.
+## See also
+- [Entropy](/wiki/entropy)
+- [Time](/wiki/time)
+- [Thermodynamics](/wiki/thermodynamics)
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