Definition of circular noun from the Oxford Advanced Learner's Dictionary

 

circular

 noun
noun
BrE BrE//ˈsɜːkjələ(r)//
 
; NAmE NAmE//ˈsɜːrkjələr//
 
 
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a printed letter, notice or advertisement that is sent to a large number of people at the same time The company will dispatch a circular to its shareholders giving details of the takeover. Word Origin late Middle English: from Old French circulier, from late Latin circularis, from Latin circulus ‘small ring’, diminutive of circus ‘ring’.
See the Oxford Advanced American Dictionary entry: circular