The word slope has specific scientific, mountaineering and mathematical meanings. A slope refers to a land form or architectural object at an angle in the sciences. Slopes are usually categorized by angles, or features of the shape of the subject. Calculation of slope angles is a particularly important design function in architecture. In mountaineering, slopes are described in terms of difficulty, and assessed for planning climbs. 
Examples of Slope:
The slope was responsible for several severe avalanches. The slope of the roof creates construction issues because of added costs. We'll have to avoid the very steep slope on the east face of the mountain. http://en.wikipedia.org/wiki/Slope http://www.tulane.edu/~sanelson/geol204/slopestability.htm http://geology.isu.edu/geostac/Field_Exercise/topomaps/slope_calc.htm 
The slope of a line is defined as the rise over the run. 
Slope warning sign in the netherlands. 
Slope warning sign in poland. 
