perpendicular
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/ˌpɜːrpənˈdɪkjələr/
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/ˌpɜːpənˈdɪkjələ(r)/
forming a right angle with another line or surface
The flagpole is perpendicular to the ground.
relating to a style of architecture from the 14th and 15th centuries in England
The Perpendicular style of architecture is known for its large windows and vertical lines.
a line, position, or direction that is exactly vertical
The painter checked the perpendicular of the wall before hanging the picture.