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perpendicular

adjective
 
 
/ˌpɜː.pənˈdɪk.jʊ.lər/ US  /ˌpɝː.pənˈdɪk.juː.lɚ/

Definition

formal at an angle of 90° to a horizontal line or surface: We scrambled up the nearly perpendicular side of the mountain.Describing angles, lines and orientationsUp and upwardMoving upwards specialized at an angle of 90° to another line or surface: The wheel rotates about an axis which is perpendicular to the plane.Describing angles, lines and orientations perpendicularly
 
 
/-li/ adverb formal or specialized
(Definition of perpendicular adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of perpendicular