slope

Noun

• the property possessed by a line or surface that departs from the horizontal
  • a five-degree gradient
    

• an elevated geological formation
  • he climbed the steep slope
    
  • the house was built on the side of a mountain
    

Verb

• be at an angle
  • The terrain sloped down
    

Related words

• Synonyms: 
  gradient , incline , side , pitch