Perpendicular (adjective)

1. Being at a right angle to a given line or surface.
2. Upright or vertical in position or direction.

Origin:

The word perpendicular comes from the latin word "perpendicularis" which means "upright" or "vertical". it was first used in english in the late 14th century to describe a line or angle that is at a right angle to a given line or surface.

Examples:

1. The ladder was positioned perpendicular to the wall, making it easy for the workers to climb.
2. The building's architecture featured many perpendicular lines, giving it a modern and geometric look.
3. The skier's jump was impressive as he landed perfectly perpendicular to the slope.
4. The key to solving the math problem was to find the perpendicular bisector of the line segment.
5. The light beam was perpendicular to the mirror and reflected at a 90-degree angle.