What is the meaning of slope?

noun

• An elevated geological formation.
  • usage: "he climbed the steep slope"; "the house was built on the side of a mountain"
  • synonyms: incline, side
• The property possessed by a line or surface that departs from the horizontal.
  • usage: "a five-degree gradient"
  • synonyms: gradient

verb

• Be at an angle.
  • usage: "The terrain sloped down"
  • synonyms: incline, pitch