Definition of perpendicular noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌpɜːpənˈdɪkjələ(r)//
; NAmE NAmE//ˌpɜːrpənˈdɪkjələr//
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the perpendicular [singular] a line, position or direction that is exactly perpendicular The wall is a little out of the perpendicular. Word Originlate Middle English (as an adverb meaning ‘at right angles’): via Old French from Latin perpendicularis, from perpendiculum ‘plumb line’, from per- ‘through’ + pendere ‘to hang’.
See the Oxford Advanced American Dictionary entry: perpendicular

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