In color theory, saturation refers to the intensity of a specific hue. Saturation is also a coordinate in the HSV color space. In art or when working with colors, saturation is the amount of color a certain color has. For example, black and white have no saturation and bright red has 100% saturation.
An atmospheric humidity of 100% represents the saturation point, at which the air can hold no more moisture. see alsoDew point
For magnetic materials, saturation is the state when the material cannot absorb a stronger magnetic field, such that an increase in magnetization does not produce significant change in magnetic flux density.