Adjective

(en adjective)

(geometry) At or forming a right angle (to).

* {{quote-magazine, date=2012-03

, author=(Henry Petroski) , title=Opening Doors , volume=100, issue=2, page=112-3 , magazine= citation , passage=A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. Applying a force tangential to the knob is essentially equivalent to applying one perpendicular to a radial line defining the lever.}}

In most houses, the walls are perpendicular to the floor .

Adjective

(-)

(geometry) Of two objects, at right angles; perpendicular to each other.

A chord and the radius that bisects it are orthogonal .

(mathematics)

# Of a pair of vectors: having a zero inner product; perpendicular.

The normal vector and tangent vector at a given point are orthogonal .

# Of a square matrix: such that its transpose is equal to its inverse.

# Of a linear transformation: preserving its angles.

# Of grid graphs, board games and polyominoes: vertical or horizontal but not diagonal.

(statistics) Statistically independent, with reference to variates.

(software engineering) Of two or more aspects of a problem, able to be treated separately.

The content of the message should be orthogonal to the means of its delivery.

Of two or more problems or subjects, independent of or irrelevant to each other.