Where does “acclivity” come from?

Acclivity derives from Latin acclivitas, meaning an upward slope, from acclivis (sloping upward), composed of ad (to) and the root ḱley- (to lean or incline) via Proto-Indo-European ḱel-.

acclivity (English): A slope or inclination of the earth, as the side...

Definitions

A slope or inclination of the earth, as the side...

Ancestry of “acclivity”, step by step

Step	Language	Word	Meaning
1	Latin	acclivitas	slope, ascent; steepness
2	Latin	acclīvis	rising, ascending
3	Latin	ad-	to; usually prefixed to verbs, in which cases it...
4	Latin	īn-	un-, non-, not
5	Latin	în	in, at, on, upon, from (space)
6	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
7	Proto-Italic	en	in
8	Proto-Indo-European	h₁én	in

Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Latin ad- →