Noun

(en noun)

A physical tilt or bend

* The inclination of his head increased and he awoke with a start.

A slant or slope

* The road up to the house had a steep inclination .

(senseid)A mental tendency

* His inclination to drink escalated to alcoholism.

(geometry) The 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 .

(obsolete) A person or thing loved or admired.

Noun

(en noun)

Something that motivates, rouses, or encourages.

* {{quote-magazine, date=2013-06-07, author=David Simpson

, volume=188, issue=26, page=36, magazine=(The Guardian Weekly) , title= Fantasy of navigation , passage=It is tempting to speculate about the incentives or compulsions that might explain why anyone would take to the skies in [the] basket [of a balloon]: perhaps out of a desire to escape the gravity of this world or to get a preview of the next; […].}}

A bonus or reward, often monetary, to work harder.