Look up time reversal in Wiktionary, the free dictionary.

Time reversal may refer to:

• Reverse motion – a visual effect in which reversing the order of the frames of a film or video makes time appear to run backward
• Reverse tape effects – an audio effect in which reversing the direction of an audio recording renders sounds backward
• T-symmetry (or time reversal symmetry) – the expected symmetry of physical laws independent of whether time runs forward or backward
• Time reversibility – the ability of some processes to operate in either direction of time
• Time reversal signal processing – a technique for focusing acoustic and electromagnetic waves by reversing in time a system's response signals
• Time travel – theorised and speculative concepts about traveling into the past or the future

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