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causality paradox

the hypothetical cause-and-effect of time travel and making changes in the past that would affect current actions. Unabridged
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causality-paradox in Science
causality paradox
A paradox resulting from hypothetical time travel, in which an individual travels back in time and performs actions that would ultimately have made the time travel impossible (as by killing one's parents at a time preceding one's birth).
The American Heritage® Science Dictionary
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