- (in science fiction) a hypothetical contradiction of cause-and-effect within a timeline that results from traveling back in time, as in the bootstrap paradox or the grandfather paradox.
- the contradiction between the concept of time in quantum physics, according to the theory of relativity, where processes are time-symmetric and reversible, and the concept of time in thermodynamics, according to the second law of thermodynamics, where processes have a direction and are irreversible.
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