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n A slope or incline.

n A rate of inclination or declination of a slope.

n (calculus) 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.

n (physics) The rate at which a physical quantity increases or decreases relative to change in a given variable, especially distance.

n (vector) 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 φ: $\backslash nabla$φ