What is "phasing out"

Usage examples of "phasing out".

The Feast of the Moons marked the simultaneous phasing out of both moons, an event that occurred only four times a year because of the unequal orbits of the Sigman satellites.

People had been talking about phasing out cash since long before the Federacy began.

So it was only a matter of time until the natural progression brought him to the point of phasing out food.

But there's more and more talk about phasing out student deferments, and I've been called for a physical.

At that point, as the charter required, the Crown began phasing out the Crown Range, granting title on the basis of improvements made, and the trouble began.