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Time reversal may refer to:
- In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — i.e. where a mirror (reverse) transformation is applied to a forward direction time state.
- Time reversal signal processing, a signal processing technique popular in acoustics, and currently being applied to electromagnetics, that results from the reversal in time of a system's response signal.
- Time travel, theorised and speculative concepts about travelling physically through time.
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