The definition of circular is round or related to being round.(adjective)
An example of something circular is a pizza pie.
Circular is defined as an advertisement that goes out to a lot of people.(noun)
An example of a circular is the Penny Saver.
See circular in Webster's New World College Dictionary
Origin: ME circulare < L circularis
See circular in American Heritage Dictionary 4
Origin: Middle English circuler
Origin: , from Anglo-Norman
Origin: , from Latin circulāris
Origin: , from circulus, circle; see circle.
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