adjective uk
/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. › 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
/-li/ formal or specialized us

(Definition of perpendicular from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

What is the pronunciation of perpendicular?
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November 26, 2014

Advices and informations Have you ever noticed strange codes in square brackets on entries in Cambridge Dictionaries Online and wondered what they mean? These are grammar codes, giving you a brief summary of how that word behaves grammatically. More information can be obtained by hovering your cursor over the code, and there’s