Longman Dictionary of Contemporary English homepage

Topic: AGRICULTURE

Date: 1300-1400
Language: Old French
Origin: perpendiculer, from Latin, from perpendiculum 'plumb line', from pendere 'to hang'

perpendicular

1 adjective
     
per‧pen‧dic‧u‧lar1
1 not leaning to one side or the other but exactly vertical [↪ vertical, horizontal]:
a perpendicular line
a perpendicular wall of rock
2

be perpendicular to something

HM if one line is perpendicular to another line, they form an angle of 90 degrees [= at right angles to]:
a road perpendicular to the highway
3

Perpendicular

AA in the style of 14th and 15th century English churches, which are decorated with straight, upright lines
perpendicularly adverb
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