alt=Two normal distributions with equal means but different standard deviations.|thumb|Two distribution curves with identical means but different variabilities.

the physiological phenomenon of variation in the time interval between heartbeats.

Climate variability includes all the variations in the climate that last longer than individual weather events, whereas the term climate change only refers to those variations that persist for a longer period of time, typically decades or more.

Human variability, or human variation, is the range of possible values for any characteristic, physical or mental, of human beings.

either the presence of, or the generation of, genetic differences.

Spatial variability occurs when a quantity that is measured at different spatial locations exhibits values that differ across the locations.