perpendicular Meaning in Cambridge English Dictionary
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Meaning of "perpendicular" - English Dictionary

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perpendicularadjective

uk   /ˌpɜː.pənˈdɪk.jə.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. specialized mathematics at an angle of 90° to another line or surface: The wheel rotates about an axis which is perpendicular to the plane.
perpendicularly
adverb uk   us   /-li/ formal or specialized

perpendicularnoun [C]

uk   /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.the perpendicular a perpendicular position or direction: The wall was leaning at an angle of ten degrees to the perpendicular.
(Definition of perpendicular from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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