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English definition of “perpendicular”

perpendicular

adjective [not gradable]  /ˌpər·pənˈdɪk·jə·lər/ us  
geometry at an angle of 90° to another line or surface: Two perpendicular lines form a right angle. Perpendicular is also standing or rising straight up: The cliff was nearly perpendicular and impossible to climb.
(Definition of perpendicular from the Cambridge Academic Content Dictionary © Cambridge University Press)
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