ACCLIV'ITY, noun [Latin acclivus, acclivis, ascending, from ad and clivus, an ascent. A slope or inclination of the earth as the side of a hill, considered as ascending, in opposition to declivity, or a side descending. Rising ground; ascent; the talus of a rampart.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI