An instrument for measuring the dip of mineral strata or for determining the slope of cuttings, embankments, etc.; also for taking altitudes.

an instrument for measuring angles, e.g. in determining the dip of geological strata or measuring altitudes; a clinometer.

Any of various instruments used for measuring the degree to which something is inclined relative to something else (esp. the horizontal).

Any of various surveying instruments used for setting out gradients or for measuring the gradient of a slope (see quots.).

Any instrument for measuring the gradient of a slope or the deviation from the horizontal.

an instrument for measuring changes in the steepness of a slope.