Drying time
The period a hardened slab needs to release excess internal moisture before floor coverings can be installed. It is entirely separate from curing and strength gain.
What does drying time mean?
Concrete reaches full strength long before it is dry enough for flooring, and the difference regularly surprises schedulers. Drying depends on slab thickness, whether it can dry from one side or two, the water content of the original mix, the building's temperature and humidity, and whether a vapor retarder sits below. Rules of thumb such as one month per inch are unreliable, which is why moisture testing exists.
In practice
This is the number-one cause of late-stage schedule fights, because the slab is structurally ready months before the flooring installer will accept it.