1. The act of saturating, or the state of being saturating; complete penetration or impregnation.
2. (Science: chemistry) The act, process, or result of saturating a substance, or of combining it to its fullest extent.
3. (Science: optics) freedom from mixture or dilution with white; purity; said of colours.
The degree of saturation of a colour is its relative purity, or freedom from admixture with white.
Origin: L. Saturatio: cf. F. Saturation.