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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October 22, 2014

We often make adjectives stronger by putting an adverb in front of them. The most common ones are very and, for a stronger meaning, extremely: He was very pleased. The ship is extremely large. However, we don’t use very or extremely for adjectives that already have a strong meaning, for example fantastic,