ACCLIVITY

ascent, acclivity, rise, raise, climb, upgrade

(noun) an upward slope or grade (as in a road); “the car couldn’t make it up the rise”

Source: WordNet® 3.1

Etymology

Noun

acclivity (plural acclivities)

(geomorphology) A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent.

Source: Wiktionary

Ac*cliv"i*ty, n.; pl. Acclivities. Etym: [L. acclivitas, fr. acclivis, acclivus, ascending; ad + clivus a hill, slope, fr. root kli to lean. See Lean.]

Definition: A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent.

Source: Webster’s Unabridged Dictionary 1913 Edition