Seeming to contradict itself or go against logic; involving two opposite ideas or qualities that somehow exist together.
From Greek 'paradoxos' meaning contrary to expectation or belief, composed of 'para-' (beyond) and 'doxa' (opinion). Added '-ical' suffix to make it an adjective.
The grandfather paradox in time travel is the ultimate paradoxical puzzle: if you went back and killed your grandfather before your parent was born, you'd never exist—so how could you go back in time to do it?
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