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causality paradox

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noun
  1. the hypothetical cause-and-effect of time travel and making changes in the past that would affect current actions.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

causality paradox in Science

causality paradox

[kô-zălĭ-tē]
  1. 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).
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.