from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. sloping upward; rising as a hillside.
from the GNU version of the Collaborative International Dictionary of English
- adj. Sloping upward; rising as a hillside; -- opposed to
from The Century Dictionary and Cyclopedia
- Rising, as the slope of a hill: the opposite of declivous.
Latin acclivis and acclivus (Wiktionary)
The eastern part of this valley is hilly, and rapidly acclivous towards the Appalachian mountains.