right angle

This term is a precise geometric descriptor used primarily in mathematics, architecture, and engineering. It carries a connotation of stability, precision, and orthogonality. While it is a technical term, it is frequently used in everyday language to describe the intersection of walls or the layout of a room.

Because it is a compound noun consisting of an adjective and a noun, the pluralization occurs only on the head noun. It is distinct from the broader term perpendicular, which describes the relationship between two lines rather than the specific measurement of the angle created by their intersection.