perpendicular Pronunciation: /ˈpɜːrpənˈdɪkjələr; ˌpɜːpənˈdɪkjʊlə(r)/Translate perpendicular | into French | into German | into Italian Spanish translation of perpendicularadj 1 (vertical) [wall/surface] perpendicular al horizonte 2 [Math] perpendicular TO sth = perpendicular a algoperpendicular in other Oxford dictionaries Definition of perpendicular in the British & World English dictionary Definition of perpendicular in the US English dictionary