An upward slope or steep incline, especially of land or terrain.
From Latin acclivitas, combining ad- (toward) + clivus (slope). The term originated in geography and geology to describe how the land rises toward higher elevations.
Technically precise but rarely used, 'acclivity' has a perfect opposite: 'declivity' (downward slope), and together they represent one of Latin's most elegant pairs of opposite terms.
Complete word intelligence in one call. Free tier — 50 lookups/day.