perpendicular Meaning in the Cambridge English Dictionary
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Meaning of “perpendicular” in the English Dictionary

"perpendicular" in British English

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perpendicularadjective

uk   /ˌpɜː.pənˈdɪk.jə.lər/  us   /ˌpɝː.pənˈdɪk.juː.lɚ/
formal at an ​angle of 90° to a ​horizontalline 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 ​wheelrotates around an ​axis that 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 ​itsbase.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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"perpendicular" in American English

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perpendicularadjective [not gradable]

 us   /ˌpər·pənˈdɪk·jə·lər/
geometry at an ​angle of 90° to another ​line or ​surface: Two perpendicular ​linesform a ​rightangle. Perpendicular is also ​standing or ​risingstraight up: The ​cliff was ​nearly perpendicular and ​impossible to ​climb.
(Definition of perpendicular from the Cambridge Academic Content Dictionary © Cambridge University Press)
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