perpendicular
Definitions
At an angle of 90° to a given line, plane, or surface.
Being at right angles to the plane of the horizon; upright or vertical.
Examples
The architect designed the support beams to be perpendicular to the main floor.
In geometry, two lines are perpendicular if they intersect at a ninety-degree angle.
She placed the ruler perpendicular to the edge of the paper to draw a straight line.
Synonyms
vertical upright orthogonal plumb erect standing right-angled