Salinity (noun)

1. The concentration of salt in a body of water or soil.
2. The quality of being saline or salty.

Origin:

From late latin salinitās, from latin sal ("sal.t")

Examples:

1. The salinity of the ocean water affects the types of plants and animals that can live there.
2. The salinity of the soil affects the growth of crops.
3. The salinity levels in the area were measured to monitor changes.
4. The salinity of the water increased after evaporation.
5. The salinity of the soil was too high for most plants to grow.