Source : Webster's Revised Unabridged Dictionary (1913)

Slope \Slope\, n.
   The part of a continent descending toward, and draining to, a
   particular ocean; as, the Pacific slope.

Slope \Slope\, n. [Formed (like abode fr. abide) from OE.
   slipen. See {Slip}, v. i.]
   1. An oblique direction; a line or direction including from a
      horizontal line or direction; also, sometimes, an
      inclination, as of one line or surface to another.

   2. Any ground whose surface forms an angle with the plane of
      the horizon.

            buildings the summit and slope of a hill.
                                                  --Macaulay.

            Under the slopes of Pisgah.           --Deut. iv.
                                                  49. (Rev.
                                                  Ver.).

   Note: A slope, considered as descending, is a declivity;
         considered as ascending, an acclivity.

   {Slope of a plane} (Geom.), the direction of the plane; as,
      parallel planes have the same slope.

Slope \Slope\, a.
   Sloping. ``Down the slope hills.'' --Milton.

         A bank not steep, but gently slope.      --Bacon.

Slope \Slope\, adv.
   In a sloping manner. [Obs.] --Milton.

Slope \Slope\, v. t. [imp. & p. p. {Sloped}; p. pr. & vb. n.
   {Sloping}.]
   To form with a slope; to give an oblique or slanting
   direction to; to direct obliquely; to incline; to slant; as,
   to slope the ground in a garden; to slope a piece of cloth in
   cutting a garment.

Slope \Slope\, v. i.
   1. To take an oblique direction; to be at an angle with the
      plane of the horizon; to incline; as, the ground slopes.

   2. To depart; to disappear suddenly. [Slang]

Source : WordNet®

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}]