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English definition of “circular”

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circular

adjective uk   /ˈsɜː.kjə.lər/ us    /ˈsɝː.kjə.lɚ/
B2 shaped like a circle: a circular flowerbed/tableclothC2 A circular argument is one that keeps returning to the same points and is not effective.
circularity
noun [U] uk   /ˌsɜː.kjʊˈlær.ɪ.ti/ us    /ˌsɝː.kjʊˈler.ɪ.t̬i/
the circularity of political arguments

circular

noun [C] uk   /ˈsɜː.kjʊ.lər/ us    /ˈsɝː.kjʊ.lɚ/
a letter or notice sent to a large number of people: Circulars and other junk mail go straight in the bin.
(Definition of circular from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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