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Date: 1300-1400
Language: Old French
Origin: circuler, from Late Latin circularis, from Latin circulus; CIRCLE1


1 adjective
1 shaped like a circle:
a circular table
2 moving around in a circle:
a circular bus route

circular argument/logic/reasoning

an argument or way of thinking that is not right because the statement it uses to prove that the argument is true can only be true if the original argument is already true
circularity noun [uncountable]

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