perpendicular
/ˌpər·pənˈdɪk·jə·lər/ adj [not gradable]Definition
› 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 adj from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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