The Collaborative International Dictionary
Acclivity \Ac*cliv"i*ty\, n.; pl. Acclivities. [L. acclivitas, fr. acclivis, acclivus, ascending; ad + clivus a hill, slope, fr. root kli to lean. See Lean.] 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.
Wiktionary
n. (plural of acclivity English)
Usage examples of "acclivities".
Happily these acclivities wound up the interior of the volcano and favored their ascent.
Architecturally the place is not remarkable, but its surface is so irregular, there are so many acclivities and deep valleys that improvements can never obliterate, that it is perforce picturesque.
It was resting at the top of one of these hard-won acclivities that we came upon--and remember that it was the middle of October--two wild roses blooming by the roadside.