The angle at which a geological body or surface deviates from the horizontal or vertical; often used synonymously with dip.

In magnetic inclination, the dip angle of the earth's magnetic field. Also known as magnetic dip.

1. The inclination of a line in a plane is the angle made with the positive x axis.

2. The inclination of a line in space with respect to a plane is the smaller angle the line makes with its orthogonal projection in the plane.

3. The inclination of a plane with respect to a given plane is the smaller of the dihedral angles which it makes with the given plane.

1. Angular deviation of a direction or surface from the true vertical or horizontal.

2. The angle which a direction or surface makes with the vertical or horizontal.

3. A surface which deviates from the vertical or horizontal.