slope
     n 1: an elevated geological formation; "he climbed the steep
          slope"; "the house was built on the side of the
          mountain" [syn: {incline}, {side}]
     2: the property possessed by a line or surface that departs
        from the horizontal; "a five-degree gradient" [syn: {gradient}]
     v : be at an angle; "The terrain sloped down" [syn: {incline}, {pitch}]
Source: WordNet® 2.0