The probability of measuring a particular flavor for a neutrino varies periodically as it propagates.

A particularly important case is that of carrying capacity that varies periodically with period T:

The inclination, or tilt, of Earth's axis varies periodically between 22 and 24.5 .

Notice that the term is constant, whereas the term varies periodically.

The sample oil is continuously sheared under a periodically varying shear rate, lower when the flats pass.

Every property, it seemed, varied periodically and was somehow linked with atomic weight.

Visual stimuli can vary periodically in space, time, or both.

In general, and/or are assumed to vary periodically, with the same period .

In both approaches, the process or time series is said to be cyclostationary if its associated probability distributions vary periodically with time.

The magnitude varies periodically as the dislocation moves within the plane.