Definition:Inclination/Plane to Plane

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The inclination between two intersecting planes is the smaller of the dihedral angles between them.

In the words of Euclid:

The inclination of a plane to a plane is the acute angle contained by the straight lines drawn at right angles to the common section at the same point, one in each of the planes.

(The Elements: Book $\text{XI}$: Definition $6$)