Perpendicular is the relationship between two lines which meet at a right angle. Look up perpendicular in Wiktionary, the free dictionary. Perpendicular may also refer to: Perpendicular axis theorem Perpendicular Gothic architecture style of mediaeval Gothic architecture in the Kingdom of England Perpendicular plate of ethmoid bone Perpendicular plate of palatine bone Perpendicular Point, New Zealand Perpendicular recording, disc drive technology Point Perpendicular, New South Wales, Australia Purpendicular, music album by Deep Purple This disambiguation page lists articles associated with the title Perpendicular.If an internal link led you here, you may wish to change the link to point directly to the intended article.