Definitions of inclination:

• noun:   the act of inclining; bending forward

  Example: "An inclination of his head indicated his agreement"

• noun:   an attitude of mind especially one that favors one alternative over others

  Example: "He had an inclination to give up too easily"

• noun:   that toward which you are inclined to feel a liking

  Example: "Her inclination is for classical music"

• noun:   (geometry) the angle formed by the x-axis and a given line (measured counterclockwise from the positive half of the x-axis)
• noun:   (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees
• noun:   a characteristic likelihood of or natural disposition toward a certain condition or character or effect

  Example: "The alkaline inclination of the local waters"

• noun:   the property possessed by a line or surface that departs from the vertical

  Example: "He walked with a heavy inclination to the right"

• noun:   (physics) the angle that a magnetic needle makes with the plane of the horizon