Meaning

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

noun (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees

noun (geometry) the angle formed by the x-axis and a given line (measured counterclockwise from the positive half of the x-axis)

originFrom Middle English inclinacioun, inclinacyon, from Old French inclination and Latin inclīnātiō. Morphologically incline + -ation.

Etymology from Wiktionary, CC BY-SA 3.0