orthogonal: Meaning and Definition of

or•thog•o•nal

1. an orthogonal projection.
1. Also,orthographic.pertaining to or involving right angles or perpendiculars:an orthogonal projection.
2. (of a system of real functions) defined so that the integral of the product of any two different functions is zero.
3. (of a system of complex functions) defined so that the integral of the product of a function times the complex conjugate of any other function equals zero.
4. (of two vectors) having an inner product equal to zero.
5. (of a linear transformation) defined so that the length of a vector under the transformation equals the length of the original vector.
6. (of a square matrix) defined so that its product with its transpose results in the identity matrix.
2. referable to a rectangular set of axes.