"The inclination of his head increased and he awoke with a start."
2.NounA slant or slope.
"The road up to the house had a steep inclination."
3.NounA tendency.
"His inclination to drink escalated to alcoholism."
4.NounThe angle of intersection of a reference plane.
"The astronomer calculated the inclination of the equator or ecliptic of Earth and the orbital planes of each visible heavenly body.; Artillery must take account of a weapon's precise inclination."