To say or claim the opposite of something someone else has said; to be in conflict with.
From Latin contra- (against) + dicere (to speak). Literally means 'to speak against.' The word has maintained this meaning for over 2,000 years.
Logic and debate depend on contradiction—if two statements contradict each other, they can't both be true. This principle is so fundamental that it's called the 'Law of Non-Contradiction,' and it's one of the foundations of all rational thinking since Aristotle's time.
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