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English definition of “perpendicular”

perpendicular

noun [C]     /ˌpɜː.pənˈdɪk.jʊ.lər/ US  /ˌpɝː.pənˈdɪk.juː.lɚ/ specialized
a perpendicular line: Draw a perpendicular from the vertex of the triangle to its base.Describing angles, lines and orientations the perpendicular a perpendicular position or direction: The wall was leaning at an angle of ten degrees to the perpendicular.Describing angles, lines and orientations
(Definition of perpendicular noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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