noun

gradient

GRAY-dee-unt/ˈɡreɪdiənt/

The rate of change in a quantity across distance.

The ramp's gradient describes how its height changes along its length.

A gently sloped ramp rises smoothly from low left to high right, with a small ball resting at the low end and clear side profile showing continuous change in level, no arrows, labels or stairs.
Etymology

The noun probably developed from grade meaning a slope. That slope sense provides a concrete image for change in level, color, or intensity across a distance.

In context

Aviation Theory10:42
we can do exactly the same in this case looking at the horizontal pressure gradient which is basically the rate at which atmospheric pressure changes with distance
Atmospheric Pressure Variations

More examples

  • The road's steep gradient makes cycling uphill difficult.
  • A pressure gradient drives air from high-pressure areas toward low-pressure areas.
  • Researchers measure salinity gradients where the river meets the ocean.

Forms

gradient · gradients

Similar words

slope
Usually describes height changing with horizontal distance, rather than other quantities.
rate
Describes change relative to time or another quantity, not necessarily distance.