Etymology
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incline (n.)
c. 1600, "mental tendency," from incline (v.). The literal meaning "slant, slope" is attested from 1846 in railroading.
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incline (v.)

in early use also encline, c. 1300, "to bend or bow toward," from Old French encliner "to lean, bend, bow down," from Latin inclinare "to cause to lean; bend, incline, turn, divert," from in- "into, in, on, upon" (from PIE root *en "in") + clinare "to bend" (from PIE *klein-, suffixed form of root *klei- "to lean"). Metaphoric sense of "have a mental disposition toward" is early 15c. in English (but existed in classical Latin). Related: Inclined; inclining.

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inclined (adj.)
c. 1300, "having a mental tendency;" 1540s, "having a physical slope," past-participle adjective from incline (v.).
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disincline (v.)

"make averse or unwilling," 1640s, from dis- + incline (v.). Related: Disinclined; disinclining.

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inclinable (adj.)
"amenable, disposed, having a mental bent in a certain direction," mid-15c., from Old French enclinable and directly from Latin inclinabilis, from inclinare (see incline (v.)).
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anticline (n.)
1861, earlier anticlinal (1849, shortened from anticlinal fold), in geology, "sedimentary rocks inclined in opposite directions from a central axis," from anti- "against" + Latinized form of Greek klinein "to lean, slope" from PIE root *klei- "to lean." Form assimilated to incline.
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list (v.1)
"to tilt, lean, incline to one side," especially of a ship, 1880, earlier spelled lust (1620s), of unknown origin. Perhaps an unexplained spelling variant of Middle English lysten "to please, desire, wish, like" (see list (v.4)) with a sense development from the notion of "leaning" toward what one desires (compare incline (v.)). Related: Listed; listing.
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inclination (n.)

late 14c., inclinacioun, "condition of being mentally disposed" (to do something), "natural disposition due to a humor or the influence of planets at one's birth," from Old 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 "to bend, turn; cause to lean" (see incline (v.)). Meaning "action of bending toward" (something) is from early 15c. That of "amount of a slope" is from 1799.

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cline (n.)

1938, in biology, "a graded series of differences within a species," a back-formation from incline or from a Latinized form of Greek klinein "to slope, to lean" (from PIE root *klei- "to lean"). Earlier, but now obsolete, was a verb cline, from Middle English clinen "to bend, bow," from Old French cliner, from Latin clinare.

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verge (v.1)
"tend, incline," c. 1600, from Latin vergere "to bend, turn, tend toward, incline," from PIE *werg- "to turn," from root *wer- (2) "to turn, bend." Influenced by verge (v.2) "provide with a border" (c. 1600); "be adjacent to" (1787), from verge (n.). Related: Verged; verging.
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