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"condition of being mentally disposed" (to do something), late 14c., from Middle French inclination (14c.) and directly from Latin inclinationem (nominative inclinatio) "a leaning, bending," figuratively "tendency, bias, favor," noun of action from past participle stem of inclinare (see incline). Meaning "action of bending toward" (something) is from early 15c. That of "amount of a slope" is from 1799.
inclination in·cli·na·tion (ĭn'klə-nā'shən)
A deviation or the degree of deviation from the horizontal or vertical; a slant.
The deviation of the long axis of a tooth from perpendicular.
A tendency toward a certain condition or character.
A characteristic disposition to do, prefer, or favor one thing rather than another; a propensity.