What action is involved when something is "saturated"?

When something is described as "saturated," it means that it has been infused or filled to its maximum capacity with a substance, often a liquid. For instance, when a sponge absorbs water until it can hold no more, it is considered saturated. This concept can also apply in various contexts, such as in chemistry where a solution reaches a point where no more solute can dissolve in the solvent. The idea of being fully filled or permeated signifies that nothing more can be absorbed or added, making "infusing or filling completely" the most accurate interpretation.

In contrast, the other choices do not align with the definition of saturation. Severely limiting something would imply reducing or restricting capacity, dropping sharply indicates a decrease, and refining or enhancing suggests a process of improvement or betterment rather than filling to capacity. Therefore, the correct understanding of "saturated" centers on the notion of fullness or complete absorption.