1a person’s natural tendency or urge to act or feel in a particular way; a disposition:John was a scientist by training and inclinationFanny showed little inclination to talk about anything serious [count noun]:he was free to follow his inclinations
(inclination for/to/towards) an interest in or liking for (something):my inborn inclination for things with moving parts
2the fact or degree of sloping:changes in inclination of the line on the graph
the angle at which a straight line or plane is inclined to another.
the dip of a magnetic needle.
Astronomy the angle between the orbital plane of a planet, comet, etc. and the ecliptic, or between the orbital plane of a satellite and the equatorial plane of its primary:cometary orbits vary widely in inclination
3an act of inclining the body or head:the questioner’s inclination of his head
late Middle English: from Latin inclinatio(n-), from inclinare 'bend towards' (see incline)
inclination in other Oxford dictionaries
Definition of inclination in the US English dictionary