Definition of perpendicular noun from the Oxford Advanced American Dictionary

 

perpendicular

 noun
noun
NAmE//ˌpərpənˈdɪkyələr//
 
the perpendicular[singular]
 
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a line, position, or direction that is exactly perpendicular The wall is a little out of the perpendicular.
See the Oxford Advanced Learner's Dictionary entry: perpendicular

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