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

 

quadrilateral

 noun
noun
BrE BrE//ˌkwɒdrɪˈlætərəl//
 
; NAmE NAmE//ˌkwɑːdrɪˈlætərəl//
 
(geometry)
 
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a flat shape with four straight sides Word Origin mid 17th cent.: from late Latin quadrilaterus (from Latin quadri- ‘four’ + latus, later- ‘side’) + -al.

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