sat·u·ra·tion / ˌsachəˈrāshən/ • n. the state or process that occurs when no more of something can be absorbed, combined with, or added. ∎  Chem. the degree or extent to which something is dissolved or absorbed compared with the maximum possible, usually expressed as a percentage. ∎  [as adj.] to a very full extent, esp. beyond the point regarded as necessary or desirable: saturation bombing. ∎  (also col·or sat·u·ra·tion) (esp. in photography) the intensity of a color, expressed as the degree to which it differs from white.

saturation In remote sensing:
1. the maximum digital number value which can be assigned to a pixel;

2. a point between the achromatic line and a pure hue of a pixel colour corresponding to the relative mixture of hues going to make up a colour.

saturation
1. A psycho-physiological measurement of the degree to which a color appears to be free of white.

2. of a transistor. See bipolar transistor.

3. of an amplifier. A state in which the signal level exceeds the dynamic range.