Meaning of “circular” in the English Dictionary

"circular" in British English

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circularadjective

uk /ˈsɜː.kjə.lər/ us /ˈsɝː.kjə.lɚ/
circularity
noun [ U ] uk /ˌsɜː.kjəˈlær.ə.ti/ us /ˌsɝː.kjəˈler.ə.t̬i/

the circularity of political arguments

circularnoun [ C ]

uk /ˈsɜː.kjə.lər/ us /ˈsɝː.kjə.lɚ/

(Definition of “circular” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"circular" in American English

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circularadjective

us /ˈsɜr·kjə·lər/

circular adjective (ROUND)

in the shape of a circle; round:

One man built a circular barn for his cows.
The circular area is used for parking.

A circular argument or discussion is one which keeps returning to the same points and does not advance to any new points or to agreement.

circularnoun [ C ]

us /ˈsɜr·kjə·lər/

circular noun [ C ] (PRINTED PAPER)

a letter or notice given to a large number of people:

The discount chain advertises sales with circulars.

(Definition of “circular” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"circular" in Business English

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circularnoun [ C ]

uk /ˈsɜːkjələr/ us COMMUNICATIONS

a printed announcement, advertisement, or letter that is sent to many people at the same time:

Details of the payout will be contained in a circular to be sent to shareholders next month.
circular
adjective [ before noun ]

The agency issued a circular letter outlining the industry-sponsored inspection program.

(Definition of “circular” from the Cambridge Business English Dictionary © Cambridge University Press)