1. gradient Noun A slope or incline.
2. gradient Noun A rate of inclination or declination of a slope.
3. gradient Noun Of a function "y" = "f"("x") or the graph of such a function, the rate of change of "y" with respect to "x", that is, the amount by which "y" changes for a certain (often unit) change in "x".
4. gradient Noun The rate at which a physical quantity increases or decreases relative to change in a given variable, especially distance.
5. gradient Noun A vector operator that maps each value of a scalar field to a vector equal to the greatest rate of change of the scalar. Notation for a scalar field ?: \nabla?