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English definition of “perpendicular”

perpendicular

adjective     /ˌpɜː.pənˈdɪk.jʊ.lər/ US  /ˌpɝː.pənˈdɪk.juː.lɚ/
formal at an angle of 90° to a horizontal line or surface : We scrambled up the nearly perpendicular side of the mountain .Describing angles, lines and orientationsUp and upwardMoving upwards specialized mathematics at an angle of 90° to another line or surface : The wheel rotates about an axis which is perpendicular to the plane .Describing angles, lines and orientations perpendicularly     /-li/ adverb formal or specialized
(Definition of perpendicular adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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