from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A causality paradox speculated about in theories of time-travel in which traveling back in time would allow one to alter the conditions at the earlier time in such a way as to make current conditions impossible, as by causing the death of one's grandfather, making one's very existence impossible.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun uncountable The
paradoxof time travelthat hypothetically occurs when one person goes back to the pastand killstheir biological grandfatherbefore the latter fathered the traveller's father, thus, by extension, preventing the traveller to ever be conceivedin the first place.
- noun countable An instance of the grandfather paradox.
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