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 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 around an axis that is perpendicular to the plane.
perpendicularly
adverb uk /ˌpɜː.pənˈdɪk.jə.lə.li/ us /ˌpɝː.pənˈdɪk.juː.lɚ.li/ formal or specialized

perpendicularnoun [ C ]

uk /ˌpɜː.pənˈdɪk.jə.lər/ us /ˌpɝː.pənˈdɪk.juː.lɚ/ specialized

(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 lines form a right angle.

Perpendicular is also standing or rising straight up:

The cliff was nearly perpendicular and impossible to climb.

(Definition of “perpendicular” from the Cambridge Academic Content Dictionary © Cambridge University Press)