Definition of slopes:
(n) :
An area of ground that tends evenly upward or downward.
(n) :
The degree to which a surface tends upward or downward.
(n) :
(mathematics, of a line, with respect to a fixed coordinate system) The ratio of the vertical and horizontal distances between two points lying on the line.
(v) :
(intransitive) To tend steadily upward or downward.
(v) :
(transitive) To form with a slope; to give an oblique or slanting direction to; to incline or slant.
(n) :
The angle a roof surface makes with the horizontal, expressed as a ratio of the units of vertical rise to the units of horizontal length (sometimes referred to as run).